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Geologic Time Scale Practice

Total questions: 17

Worksheet time: 11mins

Name
Class
Date
1.
_______________ is the long span of time that begins geologic time.
a)
Precambrian Time
b)
Cenozoic Time
2.
A unit of geologic time that subdivides eras
a)
period
b)
time span
3.
The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in what era?
a)
Cenozoic
b)
Mesozoic
4.
Scientists chose where units of geologic time began on major changes in ______________ at certain times.
a)
life forms
b)
events
5.

The Earth is believed to be about ______ years old.

a)

4.2 Billion

b)

4.6 Million

c)

5.4 Billion

d)

4.6 Billion

6.
Relative dating of rock layers tells us that the deeper we dig, _______.
a)
the younger the rocks get
b)
the smellier the rocks get
c)
the harder the rocks get
d)
the older the rocks get
7.
Identify the Era:
where dinosaurs thrived
a)
Precambrian
b)
Paleozoic
c)
Mesozoic
d)
Cenozoic
8.
Identify the Era:
First forms of life appeared in this era.
a)
Precambrian
b)
Paleozoic
c)
Mesozoic
d)
Cenozoic
9.
Which answer choice shows the geologic eras in the correct order from earliest to the most recent?
a)
paleozoic, precambrian, cambrian, mesozoic, cenozoic
b)
Precambrian, cenozoic, paleozoic, mesozoic
c)
Precambrian, paleozoic, mesozoic, cenozoic
d)
Precambrian, mesozoic, cenozoic, paleozoic
10.

According to the fossil record, when did life first appear on Earth?

a)

35,000 years ago

b)

3.5-3.8 billion years ago

c)

350,000 years ago

d)

350 years ago

11.

During which time segment of the Geologic Time Scale did fish first appear?

a)

Cenozoic Era

b)

Mesozoic Era

c)

Paleozoic Era

d)

Precambrian Time

12.

According to the fossil record, which evolved first?

a)

vertebrates

b)

invertebrates

c)

the evolved at the same time

13.

Which vertebrates have been around longer?

a)

fish

b)

amphibians

14.

Which vertebrates have been around longer?

a)

mammals

b)

reptiles

15.

A species that no longer exists is said to be _______________.

a)

extinct

b)

endangered

c)

threatened

d)

dead

16.

What important event occurred at the beginning of the Paleozoic Era?

a)

The Great Dying

b)

The Cambrian Explosion

c)

The Great Oxidation Event

d)

The Triassic Extinction

17.

When did the first humans appear?

a)

Cenozoic Era

b)

Mesozoic Era

c)

Paleozoic Era

d)

Proterozoic Eon

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