Worksheetsplate tectonics 2
Total questions: 10
Worksheet time: 12mins
Name
Class
Date
1.
Why were magnetic patterns found on the ocean floor puzzling?
a)
They showed alternating bands of normal and reversed polarity.
b)
No rocks were magnetic.
c)
They did not show alternating bands of normal and reversed polarity.
d)
All rocks were magnetic.
2.
What 3 kinds of evidence were used to prove that the seafloor spread?
a)
Rock formations, age of rocks, WWII shipwrecks
b)
Age of rocks, magnetic seafloor stripes, WWII ship logs
c)
Rock formations, magnetic seafloor stripes, age of rocks
3.
Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that
a)
the oceanic crust is melting.
b)
the denser ceanic crust is subducting under the less dense oceanic crust
c)
volcanic islands are forming.
d)
the tectonic plates are moving away from each other.
4.
Which type of crust is more dense and thinner?
a)
Continental
b)
Asthenosphere
c)
Oceanic
d)
Byers
5.
What is represented by the picture?
a)
Sea-floor spreading
b)
Pangea
c)
How the continents are arranged today
d)
Volcanoes
6.
Which of the following is where one plate slides under another plate?
a)
submarine zone
b)
divergence zone
c)
subduction zone
d)
lower zone
7.
During sea floor spreading, molten material rises up from the mantle...
a)
along the continents
b)
at the mid ocean ridges
c)
deep ocean trenches
d)
at north and south poles
8.
A _________ is a valley that forms where two plates move apart.
a)
Fissure
b)
Rift valley
c)
Sea-floor spreading
d)
Fault
9.
The Himalayas in Asia are an example of what type of plate boundary?
a)
divergent
b)
continent-to-continent convergent
c)
ocean-to-continent convergent
d)
transform
10.
Why does hot magma seep up at the crack in the ocean floor?
a)
hot magma is less dense
b)
hot magma is more dense
c)
the rocks push it up to the top
d)
the ocean water is cold enough for it to come out
100 %
