7th EOY Review: Unit 6

A scientist finds a fossil in a rock layer. According to the law of superposition, where would the oldest fossils most likely be found?

• In the topmost rock layer

• In the bottommost rock layer

• In the middle rock layer

• Scattered randomly throughout all layers

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Which of the following is a natural process that has contributed to the evolution of Earth over geologic time?

• Photosynthesis

• Plate tectonics

• Photosynthesis in animals

• Artificial selection

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What does radioactive dating help scientists determine?

• The color of rocks

• The age of rocks and fossils

• The size of fossils

• The location of earthquakes

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Which of the following is an example of physical evidence that supports the theory that Earth has changed over time?

• The presence of living animals

• Fossilized remains of ancient organisms

• The color of the sky

• The amount of rainfall

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A geologist is examining two rock layers. Layer A is above Layer B. According to the law of superposition, which layer is older?

• Layer A

• Layer B

• Both are the same age

• Cannot be determined

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Which process is responsible for the movement of continents over millions of years?

• Erosion

• Plate tectonics

• Photosynthesis

• Respiration

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A paleontologist finds a fossil in a rock layer and uses radioactive dating to determine its age. Which isotope might they use for dating a fossil that is millions of years old?

• Carbon-14

• Uranium-238

• Oxygen-16

• Hydrogen-1

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A student is given a diagram showing several rock layers with fossils in each layer. How could the student use the law of superposition to determine the relative ages of the fossils?

• By identifying the color of each fossil

• By comparing which fossils are in the lower layers to those in the upper layers

• By measuring the size of each fossil

• By counting the number of fossils in each layer

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A scientist finds identical fossils on two different continents. Which natural process best explains how these continents were once connected?

• Erosion

• Plate tectonics

• Photosynthesis

• Volcanic eruption

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A geologist uses both the law of superposition and radioactive dating to study a rock formation. What is the advantage of using both methods together?

• It allows the geologist to determine the color of the rocks

• It provides both the relative and absolute ages of the rocks

• It helps the geologist find more fossils

• It makes the rocks easier to break

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