Earth's History Final "Quest"

Earth's History Final "Quest"

Assessment

Flashcard

Science

7th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What are index fossils?

Back

Creatures that lived over a large geographic area and in a short geologic time, used to identify and date the layers of rock in which they are found.

2.

FLASHCARD QUESTION

Front

How many half-lives have occurred if a substance has decayed to one-fourth of its original amount?

Back

2 half-lives.

3.

FLASHCARD QUESTION

Front

What natural event could contribute to a mass-extinction event?

Back

A volcanic eruption.

4.

FLASHCARD QUESTION

Front

During which Era did mammals first appear?

Back

Mesozoic Era.

5.

FLASHCARD QUESTION

Front

What is the approximate age of the oldest fossils of early human ancestors?

Back

6 million years.

6.

FLASHCARD QUESTION

Front

What is the significance of the Mesozoic Era in Earth's history?

Back

It is the era during which dinosaurs dominated and mammals first appeared.

7.

FLASHCARD QUESTION

Front

Define 'mass extinction'.

Back

A widespread and rapid decrease in the biodiversity on Earth, often due to catastrophic events.

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