how scientist know something happened before billion years ago

Answers

Answer 1

Answer:

The Big Bang is commonly thought of as the start of it all: About 13.8 billion years ago, the observable universe went boom and expanded into being.

We know that life began at least 3.5 billion years ago, because that is the age of the oldest rocks with fossil evidence of life on earth.

Nonetheless, 3.5 billion year old rocks with fossils can be found in Africa and Australia. They are usually a mix of solidified volcanic lavas and sedimentary cherts.

Explanation:

I hope this helps you !!

Answer 2

Answer:

scientist and people have discovered things from a while ago and did research on it, such as dinosaur bones, etc.

Explanation:


Related Questions

what countries are located in the northern region of africa?

Answers

Answer:

Explanation:The UN subregion of North Africa consists of 7 countries at the northernmost part of the continent -- Algeria, Egypt, Libya, Morocco, Sudan, Tunisia, Western Sahara. North Africa is an economically prosperous area, generating one-third of Africa's total GDP.

Climate change is expected to cause more ____________ in precipitation and a(n) ____________ in temperature.

Answers

Climate change is
expected to cause
more _global warming_ in precipitation

The words that best complete the given sentence are:

More global warmingIncreaseWhat is Global Warming?

This refers to the depletion of the ozone layer in the atmosphere and stratosphere leads to a hotter climate.

Hence, we can see that based on the depletion of the ozone layer due to factors such as bush burning, industrial actions, etc, there would be More global warming that would lead to an increase in temperature.

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interactions in the savanna ecosystem​

Answers

Answer:

The African savanna contains a diverse community of organisms that interact to form a complex food web. ... Scavengers (hyenas, vultures) and decomposers/detritivores (bacteria, fungi, termites) break down organic matter, making it available to producers and completing the food cycle (web).

in what part of africa is the sahara desert located?

Answers

Answer:

the desert is mostly or part of it is in north Africa

Explanation:

what part of latin america the largest percentage of latin americans live

Answers

Answer:

brazil

Explanation:

it is estimated that more than 652 million people lived in Latin America or the carribean. Brazil was the most populated country in the region.

(that's all I really got)

what made the border states different from other states in the union?

Answers

Answer:

Explanation:

Border states were different from other states during the Civil War because they did not leave the Union even though they were slave states.

how do you think the desert climate affected the lives of the people living on the arabian peninsula?

Answers

Answer:it affected it as it follows

Explanation:

The harsh desert and arid climate caused many people to be nomads. Due to little farmland, nomads move from place to place seeking water and grazing, instead of settling permanently, or lived at Oases.

metamorphic rocks with a layered or banded look are called

Answers

Foliated metamorphic rocks have a layered or banded appearance that is produced by exposure to heat and directed pressure. Examples of foliated rocks include: gneiss, phyllite, schist, and slate.

5-55. In a random sample of 10,000 college students, a research company found that 35.7% were involved in a
club and 27.8% studied 4 or more hours per day. When they reported their findings, the research company
indicated that 53.4% of college students were either involved in a club or they studied 4 or more hours per day.
Given this information, what is the probability that a college student is involved in a club and studies 4 or more
hours per day?

Answers

The probability that a college student is involved in a club and studies 4 or more  hours per day is 9.92%.

Data and Calculations:

College student population = 10,000

Students involved in a club = 35.7% or 3,570 (10,000 x 35.7%)

Students who studied 4 or more hours per day = 27.8% or 2,780 (10,000 x 27.8%)

Students who involved in a club or studied 4 or more hours per day = 53.4% or 5,340 (10,000 x 53.4%)

The probability that a student, who is involved in a club, studies 4 or more hours per day is 9.92% (35.7% x 27.8%).

Thus, the probability that a student involves in a club and studies 4 or more hours per day is 9.92% or 992 students out of 10,000.

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Answer:

10.1

Explanation:

how a mineral breaks apart when it does not split evenly is known as ...

Answers

A  mineral breaks apart when it does not split evenly, which is known as. Most minerals do not split apart evenly. Instead, they have a characteristic type of fracture. Fracture describes how a mineral looks when it breaks apart.

What is a mineral?

A mineral is a naturally becoming unstructured element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. Common minerals include quartz, felspar, mica, mineral, olivine, and spar.

A mineral breaks apart when it does not split evenly, which is known as. Most minerals do not split apart, or fracture. How a mineral breaks apart when it does not split evenly. Most difficulty scale. A ranking of minerals from softest to hardest. Crystal.

Therefore, mineral breaks apart when it does not split evenly

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what is the difference between the lithosphere and the asthenosphere?

Answers

Answer:

Lithospere is the outer layer that consists of the crust and upper mantel. The asthenospere is right below the lithospere.

Explanation:

what is the elevation of mount everest in feet scientific notation

Answers

Answer:

Reaching an elevation of 29,032 feet (8,849 metres), Mount Everest is the highest mountain in the world. Mount Everest.

Flunking science need answers

Answers

The answer is C. cryosphere

Which model above best represents the tectonic plate motion that is the primary cause of new crust and deep rift valleys?

Answers

I don’t see a model anywhere

what is used by geographers to determine absolute location

Answers

Answer: coordinates such as latitude and longitude

Explanation: A place's absolute location is its exact place on Earth, often given in terms of latitude and longitude. For example, the Empire State Building is located at 40.7 degrees north (latitude), 74 degrees west (longitude). It sits at the intersection of 33rd Street and Fifth Avenue in New York City, New York.

The boundary between the stiffer mantle and the Asthenosphere is located below Earth's surface at a depth of appoximatley

Answers

Answer:

700km

Explanation:

:)

the thar desert is located __________ on the indian subcontinent.

Answers

Answer:

the thar desert is located __________ on the indian subcontinent.

Explanation:

Northwest India

please let me know if this is wrong

Why are in Asia certain religions practised in some regions and not others?

Answers

Answer:

Asia is the birthplace of all the world’s major religions and hundreds of minor ones. Like all forms of culture, Asian religions may be considered geographically in terms of both their places of origin and their distribution

What causes potential energy that accumulates in a fault to transfer to the surface during an earthquake

Answers

Answer:

Strain energy

Explanation:

Prior to an earthquake, tectonic forces result in a gradual buildup of strain energy stored on either side of the fault. When the local stresses along the fault become too large, the fault slips suddenly or ruptures and releases the stored strain energy.

how did the physical geography of greece effect their civilization?

Answers

Greek civilization developed into independent city-states because Greece's mountains, islands, and peninsulas separated the Greek people from each other and made communication difficult. The steep mountains of the Greek geography also affected the crops and animals that farmers raised in the region.

does anyone have any tips on revising for the geography exam topic 4 changing cities. i have no idea what it's about. thanks :))

Answers

Answer:

learn it very easily

first speak the answer loudly you will be learn with it

In this part of the assignment, consider the events of the early 21st century and write
an argument that explains which event you believe will have the largest long-term
effect on both the United States and the world. In your response, also make a
prediction about what you think the future holds for the United States because of
this event and why you feel this way.

Answers

The digital revolution was an event from the beginning of the 21st century that influenced the way people live and relate, generating several economic and social changes, such as globalization.

In the long run, globalization will continue to impact the US and the world, making environments multicultural and diverse, and increasingly strengthening the concept of the world as a global village.

Through new technologies, such as the internet, new paradigms of behavior, social and professional relationships and consumption are also generated.

As an advantage of the digital revolution, we can mention the improvement of scientific methods, which through information technology achieve greater accuracy and speed in identifying events, curing diseases, developing techniques for medicine, etc.

Therefore, despite the benefits arising from the digital revolution and globalization, it is necessary to control the use of these tools, as the speed of the flow of information and events can generate an increase in mental disorders and pathologies.

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what kind of crust is created during seafloor spreading?

Answers

Answer:

Mid-oceanic ridges are formed during the process of seafloor spreading. This creates new oceanic crust.

A stateless nation is often subject to all of the following except __________.
A.
discrimination and oppression
B.
genocide
C.
a lack of political control or voice in government
D.
equal recognition in the international community

Please select the best answer from the choices provided.

A
B
C
D

Answers

Answer:

D.

equal recognition in the international community

Answer:

D) equal recognition in the international community

Explanation:

Got it right on Edge :)

Using a named example, evaluate the effects of a large-scale irrigation scheme (6 marks)
• Introduction
• Locate and name the scheme
• At least 2 advantages described and explained
• At least 2 disadvantages described and explained
Concluding sentence

The irrigation Stuten should be on the Indus basin irrigation system(IBIS)

Use these points for the advantages and the disadvantages, D is for disadvantages and A is for advantages

Answers

Answer:

· Irrigation schemes are a necessity in many countries as they supply the countries with sufficient water to produce food to meet their increasing food demand (Fanadzo, 2012).In South Africa, the Vaalharts Irrigation Scheme (VHIS) is a large irrigation scheme utilising water from the Vaal River via numerous gravity fed canals ().The return flow from the VHIS enters the Harts River (via numerous ...

Explanation:

Which of the following most likely to increase the chance of the formation of a heat island?

A) Drive to work
B) Use public transportation often
C) Build a small skate park
D) Construct a shopping mall

Answers

B) Use public transportation often

the color of a mineral’s powder left behind after it is scratched on a piece of unglazed tile is its:

Answers

The color of a mineral’s powder left behind after it is scratched on a piece of unglazed tile is its mineral's streak.

What is color?

Light is the fundamental component of color. Color has the power to influence feelings, actions, and responses. The usage of the hue was mostly artistic. Three categories are primary, secondary, and tertiary were used to classify the color. Communication includes the use of color. For instance, the color red denotes both danger and affection.

The mineral powder may alternatively be called the mineral streak, depending on its color. The unglazed streak plate, sometimes known as the streak minerals, was the object that was rubbed on. The streak is the imprint still seeable on the streak plate. Surfaces that are white and firm brush against one another.

As a result, the color of a mineral’s powder left behind after it is scratched on a piece of unglazed tile is its mineral's streak.

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Hello,
I am New here and I would need help in Geography.
Would someone like to give me a little bit of information about Shrewsbury's Background/History please?
Thank You

Answers

Answer:

Hope this helps a bit

Explanation:

Shrewsbury's known history commences in the Early Middle Ages, having been founded c. 800 AD. It is believed that Anglo-Saxon Shrewsbury was most probably a settlement fortified through the use of earthworks comprising a ditch and rampart, which were then shored up with a wooden stockade.

Poema sobre la economía de Republica Dominicana

Answers

Answer:

Pedro Mir, (born June 3, 1913, San Pedro de Macorís, Dom.Rep.—died July 11, 2000, Santo Domingo), Dominican poet, whose poems celebrate the working class and examine aspects of his country’s painful past, including colonialism, slavery, and dictatorship.

By his mid-30s Mir had developed a prominent literary reputation. His social commentary, however, angered Dominican dictator Rafael Trujillo, and Mir was forced into exile in 1947. He spent the next 15 years in Cuba (where he published what is perhaps his best-known poetry collection, Hay un país en el mundo [“There Is a Country in the World”], in 1949), Mexico, and the Soviet Union. Mir returned to the Dominican Republic in 1962, a few months after Trujillo’s assassination, and continued his prolific writing career, publishing essays and novels as well as poems.

Explanation:

copied but hope it helps a lil

In cold weather, when the air lacks the precipitation to necessary to create snow, falling frozen rain often leads to a hazard called

Answers

Based on the information given, it can be inferred that the falling frozen rain often leads to a hazard that's known as hail.

It should be noted that in cold weather, when the air lacks the precipitation to necessary to create snow, falling frozen rain often leads to a hazard that's called hail.

Hail simply means a form of precipitation that's solid. It typically falls in showers and is hazardous.

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