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Geologic Time

Total questions: 34

Worksheet time: 28mins

Name
Class
Date
1.

What is the longest unit of time?

a)

Eon

b)

Era

c)

Period

d)

Epoch

2.

What Era are we currently in?

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

d)

Triassic

3.

Which Era was dominated by dinosaurs?

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

d)

Cambrian

4.

Which era began with the early invertebrates, such as trilobites and brachiopods.

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

5.

The earliest span of time in Earth history is called...

a)

Precambrian time

b)

Phanerozoic time

c)

Homeroom

d)

Cenozoic time

6.
What type of rock do fossils form in?
a)
Igneous
b)
Sedimentary
c)
Metamorphic
d)
Classic
7.
An event in time when large amounts of animals and plants die off
a)
geologic time
b)
precambrian
c)
period
d)
mass extinction
8.
The Geologic Time Scale is a record of what?
a)
old geologists
b)
sweet geology music
c)
the known history of rocks and fossils
d)
a list of every living thing ever
9.
The Law of Superposition helps scientists to determine what?
a)
The absolute age of rock layers
b)
The age of fossils
c)
The relative age of rock layers
d)
the super powers of rocks
10.
A scientist who studies fossils is called a what?
a)
Fossilologist
b)
Rock Hound
c)
Archeologist
d)
Paleontologist
11.
How old do Paleontologists believe the Earth is?
a)
2015 years old
b)
3.6 billion years old
c)
4.6 billion years old
d)
4.6 million years old
12.
According to the law of superposition, which layer is the youngest?
a)
A
b)
B
c)
C
13.
The age of a rock given as the number of years since the rock formed.
a)
relative age
b)
half-life
c)
absolute age
d)
radioactive decay
14.
The age of a rock compared to the ages of other rocks.
a)
relative age
b)
half-life
c)
absolute age
d)
radioactive decay
15.
The process in which the nuclei of radioactive elements break down, releasing fast-moving particles and decay.
a)
relative age
b)
half-life
c)
absolute age
d)
radioactive decay
16.
The time it takes half of the atoms of a radioactive element to decay
a)
relative age
b)
half-life
c)
absolute age
d)
radioactive decay
17.
A type of fossil that provides evidence of the activities of ancient organisms.
a)
trace fossil
b)
mold fossil
c)
petrified fossil
d)
cast fossil
18.
Fossils of widely distributed organisms that lived during a geologically short period.
a)
index fossil
b)
half-life
c)
radioactive dating
d)
geologic time scale
19.
In horizontal layers of sedimentary rock, each layer is older than the layer above it.
a)
mass extinct
b)
geologic time scale
c)
era
d)
law of superposition
20.
A gap in the geologic record that shows where rock layers have been lost due to erosion.
a)
extrusion
b)
unconformity
c)
intrusion
d)
law of superposition
21.

Based on the law of superposition, where would the oldest rocks be found.

a)

at the bottom

b)

at the top

c)

second from the bottom

d)

second from the top

22.

What is an unconformity?

a)

A layer of sedimentary rock

b)

A layer of rocks with unusual fossils

c)

An intrustion

d)

A missing time or gap in the rock record because of erosion

23.

What are fossils?

a)

the oldest layers of rock in a region

b)

living creatures with habitats in or around rocks

c)

preserved remains or traces of once living things

d)

objects that people of long ago left behind as artifacts

24.

Which letter matches with the OLDEST layer of rock?

a)

W

b)

X

c)

Y

d)

Z

25.

The time that it takes 50% of an element to decay is called what?

a)

the daughter product

b)

the half-wit

c)

the half-life

d)

the half-time

26.

What kind of rock would you typically find fossils in?

a)

igneous

b)

metamorphic

c)

sedimentary

27.
According to the law of superposition, which layer is the youngest?
a)
A
b)
B
c)
C
28.
Which of the following correctly lists the layers in order from oldest to youngest?
a)
A, B, C, D, E
b)
E, B, C, D, A
c)
E, D, C, B, A
d)
C, B, A, D, E
29.
An eroded sedimentary rock layer covered by another sedimentary rock layer is known as... 
a)
a disconformity
b)
an angular unconformity
c)
a nonconformity
d)
a fault
30.
An eroded nonsedimentary rock layer covered by another sedimentary rock layer is known as... 
a)
a disconformity
b)
an angular unconformity
c)
a nonconformity
d)
a fault
31.

The feature labeled E in this image is pointing to a(n)

a)

fold

b)

fault

c)

uncomfortmity

d)

formation

32.

D is a(n)

a)

sedimentary rock layer

b)

igneous intrusion

c)

fold

d)

fault

33.

The _____ says that "the present is the key to the past".

a)

Law of Superposition

b)

Principle of Uniformitarianism

c)

Law of Cross-Cutting Relationships

d)

Principle of Unconformities

34.

The time necessary for half of the parent isotope to decay into daughter isotopes.

a)

half-time

b)

parental-decay

c)

half-life

d)

half-decay

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