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Seafloor Spreading Flashcards | StudBud
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Seafloor Spreading
Seafloor Spreading
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Seafloor spreading review for a 9th grade earth science class
Flashcards
20 cards
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Practice quiz
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Host live
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Questions
20
Answers
1
During the 1940's and 1950's scientists began using _______ to map the ocean floor
Sonar
Paleomagnetism
Electromagnetism
Radar
2
The ____ rocks are found far from the MOR
Oldest
Youngest
Same age
Shallowest
3
The Pacific Plate has moved about ___ feet in your lifetime
30
2
14
6
4
Deep and narrow depressions in the seafloor with subduction of plates creates:
Tranches
Mid-Ocean Ridges
Trenches
Mid- Ocean Ranges
5
What does paleomagnetism tell us?
The speed that the plates move
the plate's rate
Iron minerals in the lava align themselves to the poles
silica minerals in the lava align themselves to the poles
6
as the seafloor spreads apart, _____ moves upward and flows from the cracks
magma
cold fresh water
newly formed rock particles
old rock
7
Where are pillow basalts found?
deep inside a volcano
at trenches
on the continent
at mid ocean ridges
8
Crust near the ridge is
Younger than the surrounding rocks
The same age
Older than the surrounding
9
Which part of the deep ocean is shallower?
Deep oceans
The Mid Ocean Ridges
The trenches
Subduction ones
10
The pattern of magnetic reversals on both sides of the ridge are:
Symmetrical
There is no pattern
Not mirrored
Adjacent
11
250 million years ago the Mid Atlantic Ocean was
Narrower
Wider
12
The width of the magnetic stripe is also an indicator of time
False
True
There is no real way to know
13
How old are the oldest ocean floor rocks?
500 million
3.4 billion
200 million
10,000
14
The Atlantic Ocean is growing faster than the Pacific Ocean
True
False
15
Seafloor is
recycled at a trench
destroyed at a trench
all of the above
created at a ridge
16
How often does the earth change its polarity?
Every year
Every million years
It has never changed
Every 100,000 years
17
New seafloor is added to both sides of the ridge in equal increments
True
False
18
The largest mountain chain lined with volcanoes are:
Mid Ocean Ridges
Subduction Zone
Mid Ocean Ranges
Trenches
19
Why does the earth not grow in size?
it grows 2 cm/year
the plates move around
the crust is recycled
20
What was it on the seafloor that truly showed Hess the seafloor was in motion?
aliens
symmetry of magnetic anomalies
presence of seamounts
symmetry of volcanoes
