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WorksheetsRestless Continents 1.8
Total questions: 16
Worksheet time: 1hrs 20mins
Name
Class
Date
1.
New oceanic lithosphere is unable to form at mid-ocean ridges.
a)
True
b)
False
2.
Bands of magnetic material in the sea floor that have opposite poles, or exhibit magnetic reversal, can provide evidence for sea floor spreading.
a)
True
b)
False
3.
What is the hypothesis that states that the continents were once one large mass that broke apart?
a)
Continental Drift
b)
Pangaea
c)
Wegener's Theory
d)
Sea-Floor Spreading
4.
The idea that the continents were once one large landmass called Pangaea is part of the theory of continental drift.
a)
True
b)
False
5.
Sea floor __________ involves plates under the ocean moving farther apart and colliding with continental plates that are then pushed away or toward each other.
a)
drifting
b)
spreading
c)
shifting
d)
movement
6.
A process that takes place at mid-ocean ridges is ____.
a)
continental drift
b)
oceanic convection
c)
sea-floor spreading
d)
volcanoes
7.
Magnetic minerals are found at mid-ocean ridges.
a)
True
b)
False
8.
This substance hardens to form new rock at mid-ocean ridges.
a)
lava
b)
magma
c)
minerals
d)
basalt
9.
Which of the following are used as evidence for continental drift?
a)
early human tools
b)
pottery shards
c)
volcanic glass
d)
fossils
10.
Which of the following is used as evidence for sea-floor spreading?
a)
opposite polarization
b)
magnetic reversal
c)
fossilization
d)
mountain ridges
11.
Which of the following is NOT a large landmass hypothesized by scientists?
a)
Gondwana
b)
Gaia
c)
Pangaea
d)
Eurasia
12.
New oceanic lithosphere forms as a result of ____.
a)
sea-floor spreading
b)
continental drift
13.
The fact that similar fossils are found on both sides of the ocean is evidence of ____.
a)
global positioning
b)
sea ridges
c)
sea-floor spreading
d)
continental drift
14.
When did Pangaea begin to break apart?
a)
20 million years ago
b)
2 million years ago
c)
a gazillion-bajillion years ago
d)
250 million years ago
15.
If the Earth’s crust is growing at mid-ocean ridges, why doesn’t the Earth grow larger?
a)
the crust shrinks in cold regions of the Earth
b)
volcanic eruptions destroy the Earth's crust
c)
the poles reverse magnetism often
d)
the crust is recycled: some sinks down while new rises up
16.
What did Pangaea break apart into first?
a)
Laurasia
b)
7 continents
c)
2 supercontinents
d)
tiny pieces
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