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WorksheetsCH 21 Earth Science Putman
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
The principle that Earth’s history can be explained by current geologic processes is
a)
unconformity.
b)
superposition.
c)
uniformitarianism.
2.
Younger layers of undisturbed sedimentary rock are above older layers according to
a)
law of superposition.
b)
the principle of uniformitarianism.
c)
he principle of sedimentarianism.
d)
angular unconformity.
3.
The boundary between two sedimentary rock layers is called a
a)
crosscut plane
b)
crosscut layer.
c)
bedding layer.
d)
bedding plane.
4.
The age of an object in relation to the ages of other objects is
a)
absolute age.
b)
relative age.
c)
comparative age.
5.
The numeric age of an object is called
a)
absolute age.
b)
relative age.
c)
relational age.
d)
comparative age.
6.
How many years of deposition are represented by a single varve?
a)
1
b)
2
c)
3
d)
5
7.
A varve is most like a
a)
fossil plant.
b)
glacial lake.
c)
igneous deposit
d)
tree ring
8.
The way fossils are formed in very dry places is called
a)
imprinting.
b)
petrification.
c)
mummification.
d)
sedimentation.
9.
How is radioactive decay used to determine the absolute age of rocks?
a)
Parent isotopes are compared to daughter isotopes.
b)
Isotopes of different compounds are compared.
c)
Radioactive substances are compared to non-radioactive substances.
d)
Daughter isotopes are compared to sister isotopes.
10.
The principle of uniformitarianism states that
a)
past processes can explain the future of biological organisms.
b)
current geologic processes can explain past processes.
c)
geologic processes are uniform throughout the Earth
11.
In radiometric dating, scientists compare the proportion of a radioactive parent isotope to a stable
a)
mother isotope.
b)
daughter isotope.
c)
sister isotope.
d)
child isotope.
12.
If the Cretaceous Period began about 146 Ma, this means it began
a)
146 million years ago.
b)
146 billion years ago.
c)
146 thousand years ago.
d)
in the year 146.
13.
Geologic time is divided into
a)
five eons.
b)
two eons.
c)
three eons.
d)
four eons.
14.
Precambrian time consists of
a)
the first eon of Earth’s history.
b)
the last eon of Earth’s history.
c)
the first three eons of Earth’s history.
d)
4 billion years between the first eon and the last eon.
15.
The Devonian Period is also known as the
a)
Age of Reptiles.
b)
Age of Mammals.
c)
Carboniferous Period.
d)
Age of Fishes.
16.
The Cenozoic Era is known as the
a)
Age of Fishes.
b)
Age of Mammals.
c)
Age of Reptiles.
d)
Age of Evolution.
17.
The Pliocene Epoch began about 5.3 Ma, or
a)
5.3 thousand years ago. 5.3 million years ago.
b)
5.3 million years ago.
c)
5.3 years after Earth formed.
d)
5.3 billion years ago. 5.3 years after Earth formed.
18.
The end of the Permian Period was marked by
a)
many new life-forms. mass extinction.
b)
mass extinction.
c)
the extinction of reptiles.
d)
domination by dinosaurs. the extinction of reptiles.
19.
On a geologic column, the oldest rocks
a)
are on the top.
b)
are on the bottom. are on the top.
c)
are in the middle.
d)
contain fossils of modern-day animals.
20.
The period during which land plants such as ferns and cone-bearing plants began to develop was called the
a)
Cambrian Period.
b)
Carboniferous Period.
c)
Permian Period.
d)
Devonian Period.
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