What type of rock would you expect to find at point A?

• clastic

• igneous

• metamorphic

• sedimentary

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By looking at the different layers of the Earth, we are able to gather information about the age and environment of that area. We can also compare its age to other layers. What is the term used to describe the age of fossil layers based on its location?

• law of superposition

• radioactive dating

• photosynthesis

• evolution

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Scientist often rely on the law of superposition to determine the relative age of fossils found within rock strata. This law states that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it. Which model represents the law of superposition?

• 
• 
• 
• 

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Radioactive dating looks at the carbon-14 remaining in __________ material.

• inorganic

• metallic

• organic

• rocky

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Which isotope is used to date ancient remains?

• Lead-40

• Uranium-235
• Oxygen-16
• Carbon-14

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Here is a picture of the ancient imprint made by a tree thousands of years ago. This imprint is a type of __________.

• fossil

• shell

• footprint

• bone

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If you find the remains of an organism that lived long ago, then you have found a ______________.

• Fossil
• Relic
• Antique
• Artifact

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Geologic time begins with a very long span called Precambrian Time. Precambrian Time ended about 544 million years ago. Scientists have organized geologic time into spans. These spans are times of different lengths. Using the model, organize the basic units of geologic time in order from shortest to longest.

• Epoch, Period, Era, Eon
• Eon, Era, Period, Epoch
• Period, Era, Eon, Epoch
• Era, Epoch, Period, Eon

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This immense mountain range began to form between 40 and 50 million years ago, when two large landmasses, India and Eurasia, driven by plate movement, interacted to form the Himalayan mountains. Which statement best explains the formation of these mountains based on the model?

• 
  Two continental plates collided at a convergent boundary.

• 
  Two oceanic crust plates collided at a convergent boundary.

• 
  An oceanic plate collided with a continental plate at a divergent boundary.

• 
  An oceanic plate collided with a continental plate at a transform boundary.

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If we review the image, we see that when tectonic plates diverge or converge, major events occur on the surface of the Earth. Magma rises to Earth's surface, volcanoes form, mountains are built and earthquakes shake the land. The force behind the movement of Earth's plates, both oceanic and continental, is generated by...

• geothermal heat energy from Earth's core.

• radioactive decay of Earth's interior elements.

• convection currents of magma in the aesthenosphere.

• 
  differences in density of the two types of tectonic plates.

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