The most ancient rocks of the Grand Canyon formed during which geologic period?
A
Permian
B
Devonian
C
Cambrian
D
Precambrian

Answers

Answer 1

Answer: hi there your answer is D

Precambrian

Explanation: Grand Canyon’s excellent display of layered rock is invaluable in unraveling the region’s geologic history. Extensive carving of the plateaus allows for the detailed study of the Earth's movements. Processes of stream erosion and vulcanism are also easily seen and studied.

The Colorado River has carved the Grand Canyon into four plateaus of the Colorado Plateau Province. The Province is a large area in the Southwest characterized by nearly-horizontal sedimentary rocks lifted 5,000 to 13,000 feet above sea level.

The Plateau’s arid climate produced many striking erosional forms, culminating in the Grand Canyon. The Canyon’s mile-high walls display a largely undisturbed cross section of the Earth’s crust extending back some two billion years.

 

Vishnu schist as displayed on the Trail of Time.

Vishnu schist as displayed on the Trail of Time.

NPS/Erin Whittaker

Three “Granite Gorges” expose crystalline rocks formed during the early-to-middle Proterozoic Era (late Precambrian). Originally deposited as sediments and lava flows, these rocks were intensely metamorphosed about 1,750 million years ago.

Magma rose into the rocks, cooling and crystallizing into granite, and welding the region to the North American continent.

Beginning about 1,200 million years ago (late Proterozoic), 13,000 feet of sediment and lava were deposited in coastal and shallow marine environments. Mountain building about 725 million years ago lifted and tilted these rocks. Subsequent erosion removed these tilted layers from most areas leaving only the wedge-shaped remnants seen in the eastern Canyon.

 

Rock layers formed during the Paleozoic Era are the most conspicuous in the Grand Canyon’s walls. Coastal environments and several marine incursions from the west between 550 and 250 million years ago deposited sandstone, shale and limestone layers totaling 2,400 to 5,000 feet thick.

Layers from the Cambrian, Devonian, Mississippian, Pennsylvanian and Permian periods are present. Erosion has removed most Mesozoic Era evidence from the Park, although small remnants can be found, particularly in the western Grand Canyon.

 

Fossil trilobite in Bright Angel Shale.

Fossil trilobite in Bright Angel Shale.

NPS/M.Quinn

Nearby rock outcrops suggest 4,000 to 8,000 feet of sedimentary layers from the “Age of Dinosaurs” once covered the Grand Canyon area. Cenozoic Era (the “Age of Mammals”) layers are limited to the western Grand Canyon and terraces near the river itself. A few sedimentary deposits formed in lake beds, but the most spectacular recent deposits are the lava flows and cinder cones on the Shivwits and Uinkaret plateaus. Volcanic activity began about six million years ago and has continued to within the last several thousand years. Spectacular lava cascades down the Canyon walls have helped date the Grand Canyon’s carving.

The Grand Canyon itself is a late Cenozoic feature, characteristic of renewed erosion during this time. Vigorous cutting by the snow-fed Colorado River

Answer 2

Precambrian is the geologic period, is the most ancient rocks of the Grand Canyon formed. Hence, option D is correct.

What is the concept of the passage?

Understanding the geologic history of the area is made possible by the superb display of stratified rock at Grand Canyon. The plateaus' extensive carving has made it possible to examine the Earth's movements in great detail. It is also simple to observe and study vulcanism and stream erosion processes.

Four plateaus of the Colorado Plateau Province were formed out of the Grand Canyon by the Colorado River. The Province is a sizable region in the Southwest distinguished by sedimentary rocks that are virtually horizontal and elevated 5,000 to 13,000 feet above sea level.

The Grand Canyon is the culmination of numerous remarkable erosional structures formed by the arid climate of the Plateau. The Canyon's mile-high walls show a cross section of the Earth's crust that dates back about two billion years and is remarkably untouched.

Thus, option D is correct.

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Related Questions

Question 5 (4 points)
(From Discovery to War: Japan and World War Il LC)
What was the purpose of the Potsdam Declaration? (4 points)
O a
Ob
Oc
Od
To announce the terms of Japan's surrender
To create a plan of attack on the Axis Powers
To draft an agreement to split France into regions
To form a treaty between Germany and Italy

Answers

Answer:

To form a treaty between Germany and Italy

Explanation:

Help help please
Why would a samurai choose death?

Answers

they would chose death to die with honor instead of being captured by the enemy and being forced to face capital punishment which would bring shame to themselves and their family

Under the rule of law, if a Jewish king didn't fllow the law,it was okay because he was the kinghe had others punished in his placehe was held accountable like anyone elsehe killed the accusers

Answers

Answer:

The Torah does not forbid a man from having multiple wives. Abraham, Jacob, David and Solomon are notable examples of biblical figures who wedded more than one wife. A close reading, however, reveals that in virtually all cases where our forefathers took multiple wives, it was for a specific reason.

Explanation:

Which task do volunteers for a political campaign usually do?

Answers

Answer:

to print posters and campaign materials. and collecting petition signatures

Explanation:

Why did the founders of Rhode Island and Connecticut leave the Massachusetts Bay Colony?

Answers

Answer:

Religious dissident Roger Williams is banished from the Massachusetts Bay Colony by the General Court of Massachusetts. Williams had spoken out against the right of civil authorities to punish religious dissension and to confiscate Native American land

Explanation:

Compare and contrast: identify differences and similarities between Christmas today and colonial Christmas, then write a paragraph explaining how Christmas has changed today.

Answers

Answer:

Christmas was originally celebrated exclusively at public gatherings, but changed in the early-19th century, when families started celebrating on their own. ... After World War II, Christmas became a more commercial holiday. A greater number of stores had Christmas decorations and music.

Explanation:

Which of the following statements about Texas after the Civil War is FALSE?
a.
The Texas state government was left without leadership as many officials fled to Mexico and South America.
b.
Texas was essentially left bankrupt after the Civil War.
c.
Thousands of dollars in gold were stolen from the Texas state treasury as the war came to an end.
d.
The Federal government didn’t arrive to occupy Texas until December of 1865.

Answers

Answer:

d

Explanation:

Answer:

d

Explanation:

If you lived on the homefront during WWI, what would you do to conserve resources?

Answers

Answer:

Personally, I would start to ration food and water, I would also start collecting any food or liquid items I can find. For water I would wait for it to rain, and start collecting rain water, and for food, I would start scrounging for any type of food.

I would also, eat any pet I have, and store the meat, If I lived near a lake, I would start fishing and collecting water ASAP.

how was the attack on pearl harbor a turning point for the united state? (Make sure u include the United States position before)

Answers

Answer:

Pearl Harbor brought the U.S. into WWII, which changed the reason of why we would fight in the war, and potentially changed the outcome of World War II. Before Pearl Harbor, the United States had declared to "remain a neutral nation" in the war by President Franklin D. Roosevelt.

Explanation:

Because first the bombing caused lots of damage and hurt people

Which of the following reform measures could voters use against a mayor they oppose?
a recall
an impeachment
a referendum
an initiative

Answers

Answer: It is A.a recall

A recall is the reform measure that voters can use against a mayor they oppose. This is the process by which voters can dismiss an elected officer through a referendum before the term of office ends.

Why was recall designed?

The practice of recalling civil servants was an attempt to minimize the influence of political parties on representatives. Widely used in the United States, this recall was initially aimed at ensuring that elected civilians act in the interests of the constituency, rather than in the interests of political parties and their conscience. The actual dismissal is usually a resignation signed by a representative elected prior to taking office. During the term of office, if the representatives' performance does not meet their expectations, the letter may be challenged by the quorum of voters.

The correct answer is option A.

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How did increasing trade and European contact affect Africans in West Africa?

Answers

Answer:

European sailors first reached sub-Saharan Africa in 1442, when Portuguese ships reached the Senegal river. The Portuguese had been sailing the coasts of Morocco and Western Sahara since 1413, when they captured the Moroccan city of Ceuta [still a Spanish city today]. Between 1413 and the 1440s, the Portuguese established several fortified settlements along the Moroccan coast, especially at Arzila, Mogador (now Essaouira), Safi, and Tangier; they retained a strong presence in Morocco until 1578, when the Portuguese King Sebastião I and much of the Portuguese nobility were killed at the Battle of Alcácer-Quibir. By 1471, West African leaders between the coasts of Senegal and Ghana had established commercial and diplomatic connections with Portuguese traders [major early sites of trade and settlement were on the Gambia river, Bugendo on the São Domingos river in Guinea-Bissau, and Sierra Leone].

Explanation:

For the next 150 years, West African rulers and traders came across the Portuguese more than any other European nation. [There were also smaller trading missions led by the English and the French, but these were less frequent]. In the beginning, the Portuguese main motivations were: 1, an interest in the extensive gold production of Bono-Mansu and the Akan states; 2, competition with the Ottoman Empire to access this gold [the Ottomans had captured Constantinople in 1453, prompting a crisis in Christian Europe]; 3, the desire to find a trade route to markets in India around the Cape of Good Hope; 4, ever increasingly, the trade in enslaved persons.

By the 1590s, the Dutch began to rival the Portuguese as the major European trading nation in Africa. Their ships were bigger and better, and the goods they traded with African political leaders were of much higher quality. The Dutch had captured many of the main Portuguese trading stations in West Africa by 1650, especially at Gorée in Senegal (in 1621), at Elmina in Ghana (in 1637), and at Luanda in Angola (in 1641). Initially the Dutch were mainly interested in textiles, animal hides [for the leather industry], and ivory, but by the middle of the 17th century they too turned to slave trading. The Dutch interest in slave trading dates to the 1620s and the capture of half of the Brazilian colonies from the Portuguese. From 1630 to 1654 the Dutch controlled the northern part of Brazil, and the associated sugar plantations which used the labour of enslaved persons; their growing colonial interests drove their interest in slave trading, which took over in the second half of the 18th century.

The Qur'an is the sacred book of Islam and is believed to be the written revelations of Muhammad.
OTrue
O False

Answers

Answer:

True.

Explanation:

Answer: True

Explanation:

The Qur'an is the holy book for Muslims, revealed in stages to the Prophet Muhammad over 23 years. Qur'anic revelations are regarded by Muslims as the sacred word of God, intended to correct any errors in previous holy books such as the Old and New Testaments.

Which of the following was the most likely cause of widespread famine in India in the late 1800s?
A
Indians were never considered equals by their British rulers.
B.
The British encouraged Indian farmers to switch from growing food to growing cotton.
C.
The British constructed a large railroad system across the country.
D
British missionaries encouraged Indians to convert to Christianity.

Answers

Answer:

b

Explanation:

they stopped making food soooo

The tiny country of Japan conquered
the Chinese island of Formosa
or
in 1895.

A. korea
B.taiwan
C. vietnam

Answers

The answer is C. Vietnam

Which of the following was a predominant Democratic Republican?

A. Alexander Hamilton
B. Thomas Jefferson
C. Benedict Arnold
D. Andrew Jackson

Answers

Answer:

A-Alexander Hamilton

Explanation:

What was most significant about the web press technology invented in the late 1800s?​

Answers

Answer: It lowered the cost of printing.

Which form of government does US currently have in the federal government?

Answers

Answer:

federal democratic republic

Explanation:

What was life like for child soldiers during the civil war in Sierra Leone?

Answers

Child Soldiers in Sierra Leone refers to the roughly 10,000-14,000 children who fought between 1991 and 2002 in the Sierra Leone Civil War. During the decade-long civil conflict which took place in Sierra Leone between 1991. Many children are forced into the labor market as a condition of necessity.

HOPES THIS HELPS YOU!!!! CAN U MARK MINE AS BRAINLIEST????

Answer:

Child soldiers had lost their childhoods and been traumatized, but many could not return home because they were seen as murderers. In 2013, Lt. Gen. Romeo Dallaire founded a nonprofit called the Child Soldier Initiative

Explanation:

Mexico is about ______ times larger than Texas and is the ____ largest country in Latin America.

Answers

Answer:

10 times large than texas anf it is the #1 largest country in latin america

Explanation:

Answer:

mexico is about 3 times larger than texas  and is the third largest country in latin america

Explanation:

Please help me with this, i am terrible at history, will gift brainiest to the person with the Correct answer.

The Warren Commission investigated the assassination of President _______________________
in 1964.

The Judiciary Act of 1789 established the __________________________ of the United States as
a tribunal of six justices.

_____________________________ discovered penicillin after an accident in his lab when mold fell in an open petri dish containing staphylococcus bacteria and killed the bacteria.

In 1982, an unknown person laced Tylenol with cyanide and placed the bottles back on the shelves
for resale leading to creation of __________________________ bottles for medication.

. On October 8, 2001, less than a month after the September 11 terrorist attacks, George W. Bush
founded the ___________________________________

On October 12, 2000, the U.S. Navy destroyer __________________________ is attacked in
Yemen by terrorists that detonate a bomb killing 17 American sailors and injuring 38 more.


. On October 14, 1947 U.S. Air Force Captain _________________________ became the first
person to fly faster than the speed of sound.


On October 28, 1919, Congress passed the _______________________ just nine months after the
18 th Amendment was ratified to enforce Prohibition.

On November 5, 1941, Top Secret Order No.1 is sent to the Combined Japanese fleet, “ bomb
___________________________ in 34 days time.”

Answers

Answer:

ugot this

Explanation:

Answer:

a

Explanation:

(18) PS help me
what was unique about Wilmington &weldon railroad & the North Carolina when they were new? i’ll mark brainlist if i can!!

Answers

Answer:

The Wilmington & Weldon Railroad (W&W) was the new name adopted in February 1855 by the Wilmington & Raleigh Railroad (completed in 1840), which ran from Wilmington to Weldon by way of Goldsboro and Rocky Mount, bypassing Raleigh. As a central rail link along the Atlantic Coast, it carried heavy traffic during the Civil War and made a considerable profit (in Confederate currency) for its owners. Because the W&W had its own facilities for rerolling iron rails and did not lie in the path of military action until the very end of the war, it suffered somewhat less than many other roads of the region and entered the Reconstruction period dilapidated but intact.

For 20 years after the war, Robert R. Bridgers of Edgecombe County served as president of the W&W. With backers including the Walters family of Baltimore, he developed interlocking directorates, leases, and traffic agreements (using the W&W as a base) that led to the formation of the Atlantic Coast Line Company and the eventual merger with the Atlantic Coast Line Railroad (ACL). In November 1872 the W&W had been leased to its southern connection, the Wilmington, Columbia, and Augusta, but the lease lapsed when the latter road failed to pay the W&W dividend in 1877. Bridgers and his associates acquired control of the Wilmington, Columbia, and Augusta in October 1879, and in June 1885 they leased it to the W&W for 99 years.

Explanation:

Who is Catherine The Great? and what are the good things she done?​

Answers

Catherine the Great was an empress of Russia who ruled for 34 years which is the longest a woman has ever ruled Russia for. She westernized Russia. She led the country to full participation in the political and cultural life of Europe. She championed the arts and reorganized the Russian law code!

Which of these gives a reason for the development of feudalism?
O
A) the need to reform an increasingly industrialized society
O B) decreasing power of the church, which failed to protect the lords
Thing
O C) Europe's emergence as a hub of trade
OD) the disintegration of Charlemagne's empire

Answers

Answer:

B

Explanation:

Why and how did feudalism develop in western Europe? The people of western Europe needed a source of protection from many invading threats with order. As a result, they invented a system in which people of higher classes provided protection for lower classes in return for their loyalty to them.

Among all the given reasons, one reason that is majorly responsible for the development of feudalism was the disintegration of Charlemagne's empire. Hence, Option D is correct.

What is feudalism?

There is a system name feudalism in which people receive protection from high-ranking society and it is for their land as well as the work that they perform.

Basically, a kind of combination is feudalism. A combination that is loaded with legal, economic, military, and cultural customs which was flourished during the 9th and 15th centuries in medieval Europe.

At the same time, protection was required by the people of western Europe from many invading threats. When Charlemagne expired, that time much of Western Europe was his empire.

As a result, with the passage of time, empire was disintegrated. Option D is correct.  

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Which of the following was NOT an important accomplishment of the Chinese?
gunpowder

movable type

Algebra

paper money

Answers

Answer: Algebra

Explanation:China has been the source of many innovations, scientific discoveries and inventions.This includes the Four Great Inventions: papermaking, the compass, gunpowder, and printing (both woodblock and movable type). The list below contains these and other inventions in China attested by archaeological or historical evidence.

How did cotton and sugar plantation owners feel about secession?

Both cotton and sugar plantation owners wanted secession.
Neither cotton nor sugar plantation owners wanted secession.
Cotton plantation owners opposed secession, while sugar plantation owners supported secession.
Cotton plantation owners supported secession, while sugar plantation owners opposed secession.

Answers

Answer:C

Explanation:

Which region receives the least amount of annual precipitation?

Mountains and Basins


North Central Plains


Great Plains


Coastal Plains.

Answers

The mountains and Basins of Texas receives the least amount of annual precipitation. It’s the second option.

Answer:

Why was the Battle of Gonzales significant?

Sam Houston was named commander of the Texas regular army

Texas declared its independence

It was the first battle of the Texas Revolution

Texas won its independence

Explanation:

Why was the Battle of Gonzales significant?

Sam Houston was named commander of the Texas regular army

Texas declared its independence

It was the first battle of the Texas Revolution

Texas won its independence

Who is considered to be the founding father of Hebrews?

Answers

Answer:

Abraham

Explanation:

Hebrews are the group who follow the Judaism, monotheistic religion. They belief in one transcendent God that is Abraham, Moses, and the Hebrew prophets.

Abraham is called Avraham Avinu is known as the founding father of Hebrews" that refers that he is the biological progenitor of the Jews.

Hence, the correct answer is "Abraham".

The formal document is should by the king outline of colonies geographic boundaries are specified how would be governed was called

Answers

Answer: charter

Explanation:

Which of the following illustrates the concept of civic virtue? (5 points)

Group of answer choices

Helping the economy grow

Doing things for the common good

Making the government strong

Becoming a wealthy individual

Answers

Answer:

Doing things for the common good

Explanation:

Civic virtue is morality or a standard of righteous behavior in relationship to a citizen's involvement in society. It's doing something good for the community.

Answer:

doing things for the common good

Explanation:

What happened in Santa Fe on August 18, 1846?
a.
Stephen Kearney led soldiers into Santa Fe and claimed that were now American citizens.
b.
Stephen Kearney led soldiers into Santa Fe to secure New Mexico for Mexico.
c.
Stephen Kearney led soldiers into Santa Fe to suppress a revolt in Taos.
d.
Stephen Kearney told traders they were forced to rely on themselves for protection.

Answers

On August 18, 1946, Stephen Kearney led his soldiers into Santa Fe and claimed that they were now American citizens.

What is the significance of Santa Fe?

The event of Santa Fe was an attempt that was made in order to capture the trade route used by both the Mexican and American traders, completely under the American control. It was led by the troops of Stephen Kearney.

Hence, option A holds true regarding Santa Fe.

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Answer: A

Explanation: Took the test, have a great day(:

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