Earth History

Front

Which best describes a fossil that helps determine the relative age of a rock layer? Options: trace fossil, index fossil, radioactive fossil, unconformity fossil

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index fossil

Front

Which process would be most effective in determining the age of fossils embedded in rock? Options: relative dating, absolute dating, use of index fossils, use of core sampling

Back

absolute dating

Front

By which method have scientists determined that the Earth is about 4.5 billion years old? Options: plate tectonics, relative dating, radioactive dating, law of superposition

Back

radioactive dating

Front

Which characteristic of carbon-14 dating helps scientists determine the approximate time a species became extinct?

Back

Carbon-14 decreases at a constant rate over time

Front

Which is the most accurate method scientists can use to estimate Earth's age? Options: relativism, superposition, relative dating, radioactive dating

Back

radioactive dating

Front

The index fossil of a type of trilobite is discovered in layer A of a set of rock layers found at three different sites of a field investigation. What conclusion can be made about the rocks in layer A at all three sites?

Back

The rocks are all about the same age.

Front

Which statement is true? Options: The oldest layers of rock and soil are closest to the surface of the earth, The youngest layers of rock and soil are farther away from the surface of the earth., Carbon-14 dating is an example of relative dating, and the law of superposition is an example of absolute dating., Absolute geologic dating and relative geologic dating are two methods used by scientists to determine the age of geologic evidence.

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Absolute geologic dating and relative geologic dating are two methods used by scientists to determine the age of geologic evidence.

Front

Which method provides the most accurate age of a rock sample? Options: superposition, relative dating, radioactive dating, index fossil identification

Back

radioactive dating

Front

Which type of rock replaces bone and other hard organic materials to create rock molds of fossils? Options: metamorphic, sedimentary, extrusive igneous

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sedimentary

Front

Rich beds of marine fossils have been found in Florida. By dating these fossils, scientists can best determine

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the period during which Florida was covered in water.