Earth's Past

How do scientists know what dinosaurs looked like?

• They observe dinosaurs in nature.

• They examine fossils for clues.

• They study cave paintings.

• They read ancient myths.

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Fossils are traces or remains of

• sunlight

• sediments

• volcanic eruptions

• living things

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Rock fossils form

• in all types of rocks

• in petrified wood

• most frequently in sedimentary rock

• most frequently in igneous rock

The body of a large prehistoric animal, such as a mammoth, complete with bones, muscle, skin, and hair, might be found preserved in

• amber

• ice

• cast fossils

• tree rings

One way scientists learn about changes that occurred in Earth's atmosphere a long time ago is by studying

• mold fossils

• carbon fossils

• ice cores

• tar cores

Two types of rock fossils are

• cast fossils and mold fossils

• plant remains and ice cores

• preserved original remains and fossils formed in rock

• fossils formed in amber and fossils formed in tar

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By studying layers of sedimentary rock, scientists can determine the

• relative ages of the layers

• absolute ages of the layers

• estimated ages of the layers

• fossil ages of the layers

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The oldest layer in an undisturbed sedimentary bed is usually

• on the top

• on the bottom

• the largest

• the smallest

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Which statement best describes how Earth changes over time?

• Earth changes very rarely.

• Earth is constantly changing.

• Earth is always changing rapidly.

• Earth has never changed.

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Humans first appeared

• during the age of mammals

• very early in Earth's history

• during the past part of the age of dinosaurs

• in the middle of the geologic time scale

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