Compare the densities of the Earth’s crust, mantle, and core?
The mantle is less dense than the core but denser than the crust.
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10
Who proposed continental drift theory?
Alfred Wegener
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15
In which layer of the earth does convection current take place?
Mantle
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15
Which kind of plate boundary occurs at A?
oceanic-oceanic divergent boundary
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15
What did scientists conclude when they discovered that stripes of ocean floor leading away from the crest showed polarities that alternate between normal and reversed?
That the earth‘s magnetic field must have flip-flopped many times since its formation.
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25
Where do most new oceanic crust form?
at mid-ocean ridges
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20
Why is the inner core solid?
The inner core is solid because of pressure exerted by Earth’s outer layers.
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25
What evidence supports Wegener's Theory? Give at least 2.
sides of continents fit together, same fossils found on different parts, mineral and rock formation
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20
Name the type of movements on the Earth's crust.
DIVERGENT, CONVERGENT, TRANSFORM
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25
What is the role of the mid-ocean ridge in the movement of lithospheric plates?
force where actual seafloor spreading occurs
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15
Why does oceanic plates go beneath continental plate?
