Week 2: That's Really Old!

The author wrote this selection most likely to -

• show students why some people live to be very old

• encourage students to become geologists

• persuade younger people that rocks and fossils are interesting

• explain how scientists find the age of fossils

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12.Fig 19D

Which sentence from the selection is best supported by information found in the Geologic Time Scale?

• Second, they would classify limestone.

• That's how she would know that the crab fossil was 290 million years old!

• Sedimentary rock is formed when bits of other rocks, dirt, and even animal bones get piled up together.

• Figuring out of a fossil's age is dirty work.

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16 FIg. 19D

According to the table, which period is part of the Paleozoic era?

• Silurian

• Jurassic

• Triassic

• Tertiary

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15B

After reading paragraph 4, a reader can conclude that-

• limestone rocks are made from the skeletons of sea creatures and the remains of old shipwrecks

• there are three types of rock: igneous, metamorphic, and sedimentary

• diagrams are useful tool to display scientific information

• geologists can learn a lot about a sedimentary rock by studying what it is made of

Which words from paragraph 3 help the reader understand the meaning of geologists?

• the age of the rock?

• scientists who study the earth

• put clues together

• sometimes they must

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4B