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Seafloor Spreading
Seafloor Spreading
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Seafloor spreading review for a 9th grade earth science class
Flashcards
30 cards
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Practice quiz
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Host live
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Questions
30
Answers
1
Deep and narrow depressions in the seafloor with subduction of plates creates:
Mid-Ocean Ridges
Mid- Ocean Ranges
Tranches
Trenches
2
The Atlantic Ocean is spreading at a faster than the Pacific Ocean
True
False
3
New seafloor is added to both sides of the ridge in equal increments
False
True
4
Why does the earth not grow in size?
the crust is recycled
the plates move around
it grows 2 cm/year
5
What was it on the seafloor that truly showed Hess the seafloor was in motion?
symmetry of volcanoes
aliens
symmetry of magnetic anomalies
presence of seamounts
6
Which layer is responsible for Earth's magnetic field
Lithosphere
Inner Core
Outer Core
Asthenosphere
7
Slab Pull occurs because...
Both Density Differences and Gravity
Gravity
Density Differences
Volcanoes
8
The pattern of magnetic reversals on both sides of the ridge are:
There is no pattern
Adjacent
Symmetrical
Not mirrored
9
The youngest seafloor is found
Farthest from the rift valley
near trenches
Farthest from the Mid-Ocean Ridge
near the Mid-Ocean Ridge
10
How often does the earth change its polarity?
Every year
It has never changed
Every million years
Every 100,000 years
11
Convection is
The transfer of energy in the form of waves
all of the above
The transfer of energy through touch
The transfer of energy in because of density differences
12
Which is not an internal heat source of Earth?
The sun
Radioactive decay
Heat left over from when Earth formed
13
Crust near the ridge is
Older than the surrounding
The same age
Younger than the surrounding rocks
14
Which layer is responsible for the movement of lithospheric plates
Inner Core
Outer Core
Lithosphere
Asthenosphere
15
How old are the oldest ocean floor rocks in the Atlantic Ocean ?
500 million
200 million
10,000
3.4 billion
16
The ____ rocks are found far from the MOR
Same age
Youngest
Shallowest
Oldest
17
Which is not found at spreading centers
Rift Valley
Mid-Ocean Ridges
All are found at spreading centers
Trenches
18
The largest mountain chain lined with volcanoes are:
Mid Ocean Ridges
Trenches
Subduction Zone
Mid Ocean Ranges
19
What is the relationship between the depth of the earthquake and the distance from the trench
Negative - as the distances decreases the depth increase
Positive - as the depth increase the distance decrease
Negative - as the depth increases the distance increases
Positive - as the depth increase the distance inceases
20
Look at C: how many episodes of Normal polarity are there
6
3
2
4
21
What does paleomagnetism tell us?
the plate's rate
silica minerals in the lava align themselves to the poles
Iron minerals in the lava align themselves to the poles
The speed that the plates move
22
The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
Subduction
Ridge-Push
Slab-Push
Seafloor Spreading
23
as the seafloor spreads apart, _____ moves upward and flows from the cracks
magma
newly formed rock particles
cold fresh water
old rock
24
Which is not a reason for plate movement
Ridge Push
Slab pull
Slab push
Convection
25
Look at B: how many episodes of Reverse Polarity have occurred?
2
6
3
4
26
250 million years ago the Mid Atlantic Ocean was
Narrower
Wider
27
What is the relationship between the age of the seafloor and the distance from spreading center
Negative: as distance increase the age increases
Positive: as distance increase the age increases
Negative: as the distance decreases the age increases
Negative: as distance increases the age decrease
28
Seafloor is
all of the above
destroyed at a trench
recycled at a trench
created at a ridge
29
the study of the record of the Earth's magnetic field in rocks, sediment, or archeological materials.
Electromagnetism
Paleomagnetism
Electrochemsitry
Magnetism
30
Out of the following examples of Seafloor Spreading, which has begun most recently
Pacific Ocean
Red Sea
East African Rift Valley
Atlantic Ocean
