A Trip Through Geologic Time

Earth is believed to be

• 4.5 trillion years old

• 4.5 billion years old

• 4.5 million years old

• 4.5 thousand years old

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When most organisms die do they form a fossil?

• Yes

• No

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Most organisms that have formed fossils died in _______.

• mud

• the desert

• water

• a forested area.

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When this ancient animal died its body was covered by ______ that eventually turned to ________.

• water/sediment

• sediment/ clay

• sediment/ rock

• rock/ sediment

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Fossils are commonly found in

• igneous rock.

• metamorphic rock.

• sedimentary rock.

• all types of rocks.

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Most organisms do not fossilize after they die, instead they are eaten or

• decompose.

• dissolve.

• evaporate.

• break apart.

Fossils of mammals are found

• in the lowest rock layers of the Grand Canyon.

• in the middle rock layers of the Grand Canyon.

• in the upper rock layers of the Grand Canyon.

• through out the entire canyon.

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The oldest organisms on Earth are believed to be

• the invertebrates of the Cambrian Period.

• single celled organisms.

• dinosaurs

• fish

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Life began

• on land

• in streams.

• in lakes

• in the ocean.

• Fish fossils are only found at the bottom of the Grand Canyon.

• Fish fossils are only found at the top of the Canyon.

• Fish fossils are found throughout the Canyon's layers.

• Fish fossils are not in the Grand Canyon rocks. Fish live in water not in a desert.

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