what can a geologist conclude about a limestone rock layer through relitive age
Answers
Answer:
The answer is A
Explanation:
I found the answer on a website
Answer:
I think your answer is B.
Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in. The age of formations is marked on a geologic calendar known as the geologic time scale. Development of the geologic time scale and dating of formations and rocks relies upon two fundamentally different ways of telling time: relative and absolute.
Relative dating places events or rocks in their chronologic sequence or order of occurrence. Absolute dating places events or rocks at a specific time. If a geologist claims to be younger than his or her co-worker, that is a relative age. If a geologist claims to be 45 years old, that is an absolute age.
Relative Dating
Superposition: The most basic concept used in relative dating is the law of superposition. Simply stated, each bed in a sequence of sedimentary rocks (or layered volcanic rocks) is younger than the bed below it and older than the bed above it. This law follows two basic assumptions: (1) the beds were originally deposited near horizontal, and (2) the beds were not overturned after their deposition.
Faunal Succession: Similar to the law of superposition is the law of faunal succession, which states that groups of fossil animals and plants occur throughout the geologic record in a distinct and identifiable order. Following this law, sedimentary rocks can be “dated” by their characteristic fossil content. Particularly useful are index fossils, geographically widespread fossils that evolved rapidly through time.
Crosscutting Relationships: Relative ages of rocks and events may also be determined using the law of crosscutting relationships, which states that geologic features such as igneous intrusions or faults are younger than the units they cut across.
Inclusions: Inclusions, which are fragments of older rock within a younger igneous rock or coarse-grained sedimentary rock, also facilitate relative dating. Inclusions are useful at contacts with igneous rock bodies where magma moving upward through the crust has dislodged and engulfed pieces of the older surrounding rock.
Gaps in the geologic record, called unconformities, are common where deposition stopped and erosion removed the previously deposited material. Fortunately, distinctive features such as index fossils can aid in matching, or correlating, rocks and formations from several incomplete areas to create a more complete geologic record for relative dating. Relative dating techniques provide geologists abundant evidence of the incredible vastness of geologic time and ancient age of many rocks and formations. However, in order to place absolute dates on the relative time scale, other dating methods must be considered.
Absolute Dating
The nuclear decay of radioactive isotopes is a process that behaves in a clock-like fashion and is thus a useful tool for determining the absolute age of rocks. Radioactive decay is the process by which a “parent” isotope changes into a “daughter” isotope. Rates of radioactive decay are constant and measured in terms of half-life, the time it takes half of a parent isotope to decay into a stable daughter isotope.
Some rock-forming minerals contain naturally occurring radioactive isotopes with very long half-lives unaffected by chemical or physical conditions that exist after the rock is formed. Half-lives of these isotopes and the parent-to-daughter ratio in a given rock sample can be measured, then a relatively simple calculation yields the absolute (radiometric) date at which the parent began to decay, i.e., the age of the rock.
Of the three basic rock types, igneous rocks are most suited for radiometric dating. Metamorphic rocks may also be radiometrically dated. However, radiometric dating generally yields the age of metamorphism, not the age of the original rock. Most ancient sedimentary rocks cannot be dated radiometrically, but the laws of superposition and crosscutting relationships can be used to place absolute time limits on layers of sedimentary rocks crosscut or bounded by radiometrically dated igneous rocks.
Sediments less than about 50,000 years old that contain organic material can be dated based on the radioactive decay of the isotope Carbon 14. For example, shells, wood, and other material found in the shoreline deposits of Utah’s prehistoric Lake Bonneville have yielded absolute dates using this method. These distinct shorelines also make excellent relative dating tools. Many sections of the Wasatch fault disturb or crosscut the Provo shoreline, showing that faulting occurred after the lake dropped below this shoreline which formed about 13,500 years ago. As this example illustrates determining the age of a geologic feature or rock requires the use of both absolute and relative dating techniques.
Explanation:
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Related Questions
Which of these is a major difference between skeletal muscle and cardiac muscle? A.Skeletal muscle works very quickly; cardiac muscle works very slowly. B.Skeletal muscle does not fatigue ; cardiac muscle is fatigues quickly. C.Skeletal muscle is involuntary ; cardiac muscle is voluntary. D.Skeletal muscle is fatigues. muscle does not.
Answers
D.Skeletal muscle is fatigues. muscle does not.
Skeletal muscle is striated muscle-essentially the fibers slide on each other to shorten and lengthen.
Cardiac muscle is a bit of a mish-mash. It is quite contractile and has striations like skeletal muscle, but also has discs within the structure which speed the contractile process
Skeletal muscle is voluntary and will not contract unless stimulated by a nerve fiber (or an electrode). Cardiac muscle is involuntary and contracts even without nervous stimulation.
Answer:
D.Skeletal muscle gets fatigued while the cardiac muscle does not.
Explanation:
Cardiac Muscle Skeletal Muscle
Length
Shorter Longer
Controlled by
Autonomic nervous Somatic nervous
system system
The key difference between skeletal muscle and cardiac muscle is that skeletal muscle is under voluntary control while cardiac muscle is under involuntary control. Muscle tissue is one of the four types of tissues present in the animal body.When does a zygote become an embryo?
once the embryo forms a heart, lungs, and brain
a few minutes after the male and female gamete fuse
once the zygote enters a safe environment either inside or outside of their mother
once the zygote starts dividing by mitosis and cell differentiation occurs
Answers
Answer:
Explanation:
The transformation of a zygote into an embryo adheres both to nature and to nurture: not only genetics but also environment determines the outcome. This idea has assumed many forms. A territory in the early sea urchin blastula contains clones of founder cells, and each clone contributes exclusively to one territory (Cameron & Davidson, 1991). Both the lineage of a founder cell, i.e. its nature, and the position of a founder cell, which determines how it is nurtured, contribute to its fate. Fertilisation, the topic of the first Forum, fixes the genes; interblastomere communication, the topic here, regulates gene expression. Blastomeres communicate like any other cell – via ligand-receptor interactions and through gap junctions. Saxe and DeHaan review these mechanisms. The definition of ligands and receptors becomes broadened in this context, and cell adhesions as well as gap junctions enter into the story. In spite of these entanglements, it appears that nature uses the same sorts of mechanisms to get cells to specialise that she uses to keep them talking. Thus, neurons and glial cells signal to one another via glutamate receptors and gap junctions (Nedergaard, 1994). Likewise, we expect neurotransmitters (and neurotransmitter transporters) to help signal differentiation. The biophysicist may ask whether electrical properties also play a role, but that we reserve for another Forum. If gap junctions figure in development as fusion pores that pass small molecules and electrical signals between blastomeres, another parallel suggests itself. Brian Dale asked in the first Forum: How does a spermatozoon activate an oocyte? This question, which concerns gamete communication, has produced two schools of thought and remains controversial (Shilling et al., 1994). Do sperm activate oocytes via contact-mediated mechanisms or through fusionmediated mechanisms? Or do both mechanisms occur, as they appear to in development?
Which region of the human alimentary tract has both the largest population of bacteria and the greatest species diversity
Answers
The region of the human alimentary tract that has both the largest population of bacteria and the greatest species diversity is the the colon.
The normal flora of the alimentary tractNormal flora are those microorganisms that resides in a living organism without causing it harm or diseases.
These normal flora become established in different parts of the body from birth such that the normal flora found in the mouth is not the same as the one found in the colon of the alimentary tract.
From research works, the large intestine (colon) is known to contain 100 billion per milliliter of fluid culture.
The massive numbers of bacteria in the large intestine (colon) creates a great special variation in the flora. The streptococci and lactobacilli found in the colon often adhere to cells by means of capsules surrounding the bacteria.
Therefore, the region of the human alimentary tract that has both the largest population of bacteria and the greatest species diversity is the the colon.
Learn more about normal flora here:
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URGENT PLEASE HELP, WORTH 100 POINTS!!
1.What happens as the number of niches in an ecosystem goes up?:
1- biodiversity decreases
2- biodiversity increases
3- endangered species goes up
4- ecosystem stability goes down
2.What group of organisms has the greatest number of species?:
1- animals
2- insects
3- plants
4- protists
3.Why do coral reefs have such a high biodiversity?:
1- they have many different niches
2- they are found in northern latitudes
3- they are found in deep, warm waters
4- they have an unusually uniform habitat
Answers
Explanation:
1.What happens as the number of niches in an ecosystem goes up?:
Biodiversity increases- As the number of niches increases, I suppose there would be more competition for space
2.What group of organisms has the greatest number of species?
insects-In terms of numbers of species, insects certainly represent the largest percentage of the world's organisms. There are more than 1 million species of insects that have been documented and studied by scientists.
3.Why do coral reefs have such a high biodiversity?
they have many different niches-High biodiversity ensures the health of the reef. It spreads those roles across many species, so if one species is affected by a disease or other threat, that role won't be lost on the reef.
what can help climate change the least?
A) A carbon tax
B)Economic growth
C) Increased energy effciency
D) Technological growth
Answers
Answer:
Economic growth
Explanation:
It would help the planet plants animals and people
Question 3 of 5
Which model best shows the movement of carbon dioxide during
photosynthesis?
O A. Atmosphere - plant
O B. Plant
atmosphere
O C. Soil
plant
O D. Plant
-
soil
SURMIT
Answers
Answer:
The answer is B: plant atmosphere
Answer:
Plant - atmosphere !
Explanation:
Hope this helps <3
What happens when 2 objects fall in a tight closed room?
Answers
Answer:
all objects free fall at the same rate regardless of their mass.
Explanation: Heavy objects fall at the same rate (or speed) as light ones
A biologist was in a forest when he came across a family of squirrels hiding nuts for
the winter. The biologist was interested in this behavior, so he stayed and watched the
squirrels for a few hours. He recorded what he observed in a notebook. Which of the
following explains why this type of research is NOT considered an experiment?
O The biologist did not observe the squirrels for long enough to collect data.
The biologist did not collect valid data on the different species of squirrels present.
O The biologist observed the squirrels and did not test variables.
O The biologist came across the squirrels by chance and had no formal plan.
Answers
Answer:
biologist observed the squirrels and did not test variables
someone answer please I need someone to answer
Answers
osmotic potential definition
Answers
Answer:
osmotic potential (OP value) a measure of the tendency of a solution to withdraw water from pure water by OSMOSIS across a differentially permeable membrane. Pure water has an osmotic potential of zero at one-atmosphere pressure
Explanation.
What does dna have that determines all my traits
Answers
Answer:
These sections of DNA that contain information that determine your physical features are called genes. Since you have two pairs of chromosomes, you also have two pairs of genes, one from your father and one from your mother. These pairs of genes then determine certain physical features or traits.
Explanation:
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Question 1 of 17 Pag
Question 1
Different substances have different properties that can be used to identify them. There are three test tubes X, Y, and Z filled with gas.
Can the properties of the gas in each test tube be used to tell whether the gases are the same or different?
What do you think might happen when a gas is exposed to a small flame? List as many possible results as you can think of
Next Page
Back
Answers
The properties of the gas in each test tube can be used to tell whether the gases are the same or different, because depending on the substance, chemical reactions will occur.
What do you think might happen when a gas is exposed to a small flame?This happens in the flame test, which is based on the fact that when a certain amount of energy is supplied to a certain chemical element (in the case of a flame, energy in the form of heat), some electrons in the last valence shell absorb this energy.
Moving to a higher energy level, producing what we call an excited state. When one of these excited electrons returns to the ground state, it releases the energy previously received in the form of radiation.
With this information, we can conclude that the properties of the gas in each test tube can be used to know if the gases are the same or different, because depending on the substance, chemical reactions will occur.
Learn more about gases in brainly.com/question/1369730
Elisabeth is an oceanographer. On which of the following research expeditions would she travel from the photic zone to the aphotic zone?
A.) A snorkel trip from the intertidal zone to 55 feet off the beach
B.) A scuba trip from the surface down 100 feet
C.) A submersible traveling from the ocean surface to the abyss
D.) A research vessel from the beach to the open ocean
Answers
A research expedition traveling from the photic zone to the aphotic zone, is a submersible traveling from the surface of the ocean to the abyss.
What is aphotic zone and photic zone?Depending on the lighting, the waters are divided into:
PHOTIC ZONE → up to 200 m deep. DYSPHOTIC ZONE → between 200 m and 400 m deep. APHOTOTIC ZONE → below 400 m depth.With this information, we can conclude that a research expedition traveling from the photic zone to the aphotic zone, is a submersible traveling from the surface of the ocean to the abyss.
Learn more about aphotic zone and photic zone in brainly.com/question/1350513
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Answer:
A submersible traveling from the ocean surface to the abyss
Explanation:
Why are common areas difficult to conserve
Answers
Answer:
The production and consumption of natural resources is necessary for society to function
Explanation:
Which factors affect the type of cloud that will be formed? select three choices. altitude temperature color of clouds size of ice pellets whether water condenses as liquid or ice
Answers
Answer:
To conclude, many factors affect cloud formation, including topography, air temperature, and humidity.
Explanation:
The factors affect the type of cloud that will be formed are temperature , color of clouds and water condenses as liquid or ice.
These factors affect the formation of clouds as cloud formation will have the all factors like humidity, water, temp, and also sometimes light.
What is altitude?It is the height of mountains or any plains, pleautue, and several other earth mountains, valley and sometimes also of the himalyan mountains.
Thus it is well explained.
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Please help with this question I have
Answers
What morphology is represented in the picture?
O Spirilla
O Rod shaped
O Filamentous
O Cocci
Answers
Which of the following is true?
O Rivers account for most of the earth's surface water
O Earth's water = 60% Ocean and 40% Freshwater
O Glaciers and Icecaps account for most of the freshwater on earth
O Most of the earth's freshwater is groundwater like rivers and lake
Answers
Answer:
C. Glaciers and Icecaps account for most of the freshwater on earth
Explanation:
Glaciers and icecaps make about 68.7% of the freshwater we have here on earth.
I hope it helps! Have a great day!
Sandra~
Answer:
C.
Explanation:
Glaciers and icecaps make about 68.7% of the freshwater we have here on earth, so that would make the answer C.
I hope it helps! Have a great day!
bren~
If you do more work in less time you have displayed more __
PE
Work
Joules
Power
Answers
Answer:
Power or #4
Explanation:
If you do more work in less time you have displayed more Power.
:)
Which type of fiber helps a person feel full, therefore possibly causing weight loss?
Answers
Answer:
soluble fiber
Explanation:
soluble fiber draws water into your gut, which softens your stools and supports regular bowel movements. it not only helps you feel fuller and reduces constipation but may also lower your cholesterol and blood sugar level.
Which level of taxonomy is the largest and most inclusive? Group of answer choices phylum Domain species order
Answers
Answer:
Domain
Explanation:
The order of classification is like this (from biggest to smallest):
Domain -> Kingdom -> Phylum -> Class -> Order -> Family -> Genus -> Species
Hope this helped!
Which part of the plant contains the most chlorophyll?.
Answers
Answer:
The palisade layer
The palisade layer contains the most chloroplasts as it's far close to the pinnacle of the leaf. The chloroplasts comprise the pigment chlorophyll. The palisade cells are organized upright.
The central cavity of a blood vessel is called the.
Answers
Answer:
The central cavity of a blood vessel is called the: Lumen.
Explanation:
please consider as brainlest
Of the four animals (human,cat,whale,bat) which would you argue are the most closely related on the evolutionary tree?Justify your answer
Answers
Answer:
I think humans and whales are closely related on the evolutionary tree because they are both mammals and both have endoskeleton
which natural resource is mined to, produce a digital phone? pls help me
Answers
Which animal trait was Darwin's theory of natural selection based on? (1 point)
O swimming ability of Galápagos iguanas
O beak morphology of Galápagos finches
O predatory behavior of foxes
o coloration of peppered moths
Answers
Answer:
beak morphology of Galápagos finches
Answer:
Beak Morphology.
Explanation:
His theory was based off of the finches from different areas and their ability to pick up food. The beak shape was based off of the diet of the bird. For example, if a finch had a diet consisting of seeds, it had a dense, powerful beak that was able to crush the seed.
How does the length of shadow on the sun stick differ at noon and in the late afternoon? Why?
A. The shadow is longer at noon because the sun is at an angle.
B. The shadow is longer in the late afternoon because the sun is at an angle.
C. The shadow is longer at noon because the sun is directly overhead.
D. The shadow is longer in the late afternoon because the sun is directly overhead.
Answers
Answer:
The answer is C hope this helps
The length of the shadow on the sun stick differs at noon and in the late afternoon, the shadow is longer in the late afternoon because the sun is at an angle.
What do you mean by Shadow?Shadow may be defined as the dark figure thrown upon a surface by a body blocking the rays from a source of light.
When the sun is at an angle usually in the early morning or late afternoon, the shadow of any object is found to be larger as compared to its original shape.
Therefore, the length of the shadow on the sun stick differs at noon and in the late afternoon, the shadow is longer in the late afternoon because the sun is at an angle.
To learn more about the shadow, refer to the link:
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Please help. This in an crossword puzzle.
Answers
1 it is a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
A. Reverse fault
B. Normal fault
C. fault
D. Earthquake
Answers
it is a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
The correct answer is letter D. Earthquake.
Earthquakes can be caused by movement of plate tectonics, eruption of volcanoes, and also man-made like huge explosions cause by explosive devices.
How many breeds of elephant are there?
Answers
Answer:
3
Explanation:
Answer:
There are 3 different species or breeds of elephants.
Explanation:
They are:
- The African Savanna aka Bush Elephants
- The Asian Elephants
- The African Forest Elephants
I hope it helps! Have a great day!
Anygays-