How Do Fossils Form

Which organism is most likely to form a fossil by becoming preserved in amber?

• bird

• fish

• clam

• ant

A fossil that is formed by sediments filling up a mold is a(n)

• Cast fossil

• Mold fossil

• Trace fossil

• Amber

___________ ___________ show evidence of the activity of ancient organisms, such as tracks or nests.

• dead fossils

• Mold fossils

• Cast fossils

• Trace fossils

What is a fossil mold?

• Yesterdays food

• Nonrenewable resources

• An impression of an ancient organism.

• Renewable resources

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Millions of years ago, the remains of dead plants and animals were buried by sediments. Through the action of time and pressure over millions of years, these remains changed form. We now call these changed remains

• Fossil fuels

• Natural gas

• Renewable resource

• Nonrenewable resources

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Greg puts a shell into some clay and pulls it out. He made something that looks like ______.

• a glacier

• a fossil

• a plant

• coal

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What is the first step in the process of becoming a fossil?

• an animal dies

• the remains decay

• minerals seep into the bones

• the bones are covered by sand, mud or dirt

Which animal part would form a fossil?

• fur

• lung

• bone

• muscle

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How can an organism become a fossil?

• it can be left in the hot sun

• it can be covered with sand

• it can be trapped in tree resin

• it can decompose quickly

What is the primary condition necessary for an organism to become fossilized?

• Rapid burial under sediment

• Exposure to sunlight

• Presence of oxygen

• High temperatures