Science Unit 5 Review

Front

How do index fossils help determine the age of a rock layer?

Back

They formed at only one particular time.

Front

What is a mass extinction?

Back

many species become extinct over a short period of geologic time

Front

Which of the following fossils would make a good index fossil?

• a crab that lived only in Florida, in a small population during the Cenozoic period
• a dragon fly that lived in all areas of the United States, only in large populations during the end of the Paleozoic
• a maple tree that lived in northwest part of Ohio, in a small population during the Mesozoic
• a daisy flower that lived in the eastern United States, in large populations during the entire Cenozoic period

Back

a dragon fly that lived in all areas of the United States, only in large populations during the end of the Paleozoic

Front

What have scientists determined about woolly mammoths?

Back

They were able to live in the very cold climate of the ice age.

Front

How could you demonstrate relative dating using a stack of newspapers?

Back

By describing the placement of the papers within the entire stack.

Front

What does the fossil record refer to?

Back

the fossils in the rock layers on Earth

Front

Ms. Resner found fossils such as coral, clams, and fish in her backyard. What does this indicate about the environment many years ago?

Back

An ocean once covered the area.

Front

Which could result in a mass extinction?

Back

no rain for long periods of time