Grade 6 Chapter 6.5

1.

1 point

How much geologic time do the layers of rock exposed at Grand Canyon National Park represent?

10 million years

6 million years

2 billion years

6 billion years

2.

1 point

The rocks of the Green River formation were formed

in a swamp.

on a river bottom.

on an ocean floor.

in a series of lakes.

3.

1 point

How do geologists use the geologic time scale?

to record catastrophes

to predict future mass extinctions

to divide Earth's history into distinct intervals

to date rocks

4.

1 point

How many years of Earth's history do geologists study?

4.6 billion years.

about 5 million years

between 2.5 and 3.5 billion years

less than 1 million years

5.

1 point

The eon during which the earliest known rocks formed on Earth was called_______.

Proterozoic

Phanerozoic

Hadean

Archean

6.

1 point

The eon from which scientists have found rocks and meteorites only from the ocean is called____________.

Archean

Phanerozoic

Hadean

Proterozoic

7.

1 point

The eon in which we live is called__________.

Hadean

Proterozoic

Archean

Phanerozoic

8.

1 point

The eon in which the first organisms with well-developed cells appeared is called the _________.

Archean

Phanerozoic

Hadean

Proterozoic

9.

1 point

This is the largest division of geologic time.

epoch

era

eon

period

10.

1 point

The second-largest division of geologic time is called________.

a period

an era

an epoch

an eon

11.

1 point

The third-largest division of geologic time is known as__________.

an era

an eon

a period

an epoch

12.

1 point

The fourth-largest division of geologic time is called a(an)________.

era

eon

period

epoch

13.

1 point

What is extinction?

the appearance of a new species

the death of a species

the end of an era

the endangerment of a species

14.

1 point

What kind of life flourished at the beginning of the Paleozoic era?

mammals

marine life

birds

reptiles

15.

1 point

How did the Paleozoic era end?

Nearly 90% of all marine species became extinct.

About half of all species became extinct.

More species appeared than at any other time in Earth's history.

Only plants were living on Earth.

16.

1 point

Why is the Mesozoic era called the Age of Reptiles?

Mammals were evolving.

Reptiles were the dominant species.

Birds were too small to be dominant.

There were more mammals than ever before.

17.

1 point

What percentage of species on Earth became extinct at the end of the Mesozoic era?

1-5%

75-80%

15-20%

50-80%

18.

1 point

When did the Cenozoic era begin?

50,000 years ago

65.5 million years ago

40 million years ago

1 million years ago

19.

1 point

Which of these traits probably helped mammals survive?

the ability to regulate body temperature

hair on their bodies

the ability to grow food

the ability to swim