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Geological Stratigraphy

Total questions: 20

Worksheet time: 22mins

Name
Class
Date
1.

The law of superposition helps scientists to determine what?

a)

The age of fossils

b)

The absolute age of rock layers

c)

The relative age of rock layers

d)

The origin of the universe

2.
Which principle or law states that "the processes that shape the world today also operated in the past."
a)
Uniformitarianism
b)
Original Horizontality
c)
Lateral Continuity 
d)
Superposition 
3.

Which principle or law states that "When layers of sediments are deposited, they settle in flat, horizontal layers due to gravity."

a)

Uniformitarianism

b)

Original Horizontality

c)

Lateral Continuity

d)

Superposition

4.
The best index fossils have which two traits?
a)
widespread geographically, long lifespan
b)
widespread geographically, short lifespan
c)
specific place, long lifespan
d)
specific place, short lifespan
5.
The age of a rock layer compared to the other rock layers around it is called
a)
Absolute Age
b)
Relative Age
c)
Comparative Age
d)
Layer Age
6.
Letter "F" is a....
a)
inclusion
b)
intrusion
c)
fault
d)
unconformity 
7.
The table shows the radioactive decay of carbon-14. Part of the table has been left blank. 
 After 22,800 years, approximately what percentage of the original carbon-14 remains? 
a)
15%
b)
12.5%
c)
6.25%
d)
3.125%
8.
If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?
a)
25 years
b)
200 years
c)
400 years
d)
800 years
9.
You find a rock sample with radioactive atoms present.  If 25% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)
a)
zero
b)
1
c)
2
d)
3
10.
The Principle of Cross-Cutting Relationships states that an igneous intrusion is 
a)
always younger than the layers it cuts across
b)
always older than the layers it cuts across
c)
the same age as the rock it melted
d)
none of the answers are correct
11.
Letter "A" is an....
a)
inclusion
b)
intrusion
c)
fault
d)
unconformity 
12.
A record of the geologic events and life forms in Earth's history.
a)
index fossil
b)
half-life
c)
radioactive dating
d)
geologic time scale
13.

What is the longest unit of time?

a)

Eon

b)

Era

c)

Period

d)

Epoch

14.

What Eon are we currently in?

a)

Phanerozoic

b)

Hadean

c)

Archaen

d)

Proterozoic

15.

Which Era was dominated by dinosaurs?

a)

Paleozoic

b)

Mesozoic

c)

Cenozoic

d)

Cambrian

16.

What type of event usually marks the end of an Era

a)

A Mass Extinction

b)

A Quinceanera

c)

An earthquake

d)

Evolution of a species

17.
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
18.
What type of rock do fossils form in?
a)
Igneous
b)
Sedimentary
c)
Metamorphic
d)
Classic
19.

Cyanobacteria added this to the atmosphere

a)

carbon dioxide

b)

nitrogen

c)

carbon monoxide

d)

oxygen

20.

The first Eon in Earth's history is known as the

a)

Archean

b)

Hadean

c)

Phanerozoic

d)

Proterozoic

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