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Geologic Time

Total questions: 25

Worksheet time: 29mins

Name
Class
Date
1.
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
2.
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
3.
What type of rock do fossils form in?
a)
Igneous
b)
Sedimentary
c)
Metamorphic
d)
Classic
4.
According to the law of superposition, which layer is the youngest?
a)
A
b)
B
c)
C
5.
Why is the fossil record incomplete?
a)
fossils get eroded away over time
b)
most organisms never became fossils
c)
scavengers and decomposers eat them too quickly
d)
all of the above
6.
Paleozoic, Mesozoic & Cenozoic are all
a)
Epochs
b)
Eras
c)
Periods
d)
Eons
7.
Which is the most recent era of time- the one that we are currently in?
a)
Mesozoic 
b)
Paleozoic 
c)
Cenozoic 
d)
Precambrian 
8.
The dinosaurs and reptiles were dominant in which Era?
a)
Precambrian
b)
Mesozoic
c)
Paleozoic
d)
Cenozoic
9.
The disappearance of a species.
a)
Evolution
b)
Extinction
c)
Migration
d)
Mutation
10.
This provides information about the history of life on earth and how organisms lived and evolved over time.
a)
fossil data
b)
fossil evidence
c)
fossil  record
d)
remains of fossil
11.
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
12.
The age of a rock compared to the ages of other rocks.
a)
relative age
b)
half-life
c)
absolute age
d)
radioactive decay
13.
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
14.
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
15.
An igneous rock later formed when lava flows onto Earth's surface and hardens.
a)
extrusion
b)
index fossil
c)
intrusion
d)
uncomformity
16.
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
17.
An igneous rock layer formed when magma hardens beneath Earth's surface.
a)
extrusion
b)
index fossil
c)
intrusion
d)
unconformity
18.
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
19.

What is the approximate percentage of Earth’s history during which humans have existed, compared to the age of Earth?

a)

0.04%

b)

1.79%

c)

4.65%

d)

8.32%

20.

Which fossil has not been found in the New York State rock record?

a)

Silurian eurypterids

b)

Triassic dinosaur footprints

c)

Permian trilobites

d)

Pleistocene mastodont bones

21.

Columns A, B, C, and D below represent outcrops, of the same sequence of bedrock layers, found within 20 miles of each other. The rock layers have not been overturned.

Which surface bedrock is youngest in age?

a)

siltstone

b)

dolostone

c)

limestone

d)

sandstone

22.

A Elliptocephala fossil was found in the surface bedrock at 43° N 73°30 W. In which New York State landscape region was this fossil found?

a)

Adirondack Mountains

b)

Taconic Mountains

c)

Allegheny Plateau

d)

Champlain Lowlands

23.

The photograph shows a New York State index fossil.

What is the best classification of this fossil, and during which geologic time period did the organism that produced this fossil exist?

a)

Classification: Coral

Geologic time period: Permian

b)

Classification: Coral

Geologic time period: Ordovician

c)

Classification: Trilobite

Geologic time period: Permian

d)

Classification: Trilobite

Geologic time period: Ordovician

24.

The graph shows the number of radioactive Isotope X atoms present as a sample of the isotope undergoes radioactive decay.

Based on the graph, the half-life of this radioactive isotope is

a)

6h

b)

9h

c)

3h

d)

12h

25.

Based on the graph, what is the approximate number of radioactive atoms of Isotope X that are present when 8 hours of decay has occurred?

a)

90

b)

115

c)

155

d)

200

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