Answer:
A
Explanation:
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Answer:
B) near sea level
Explanation:
Firstly, Isostasy is an equilibrium of adjacent lithosphere floating on the asthenosphere . The continental crust been solid floats on the denser mantle and balance the equilibrium between the portion on the mantle and the elevated parts.
The higher it elevation on the lithosphere or continental crust the more portion of the crust that sinks into the aesthenospere to balance the equilibrium. Therefore to balance a 40km thickness of continental crust requires more portion sinking into the interior of the earth(mantle) .
Both continental crust(40km and 20km) will be near sea level to be in equilibrium.
Constructive plate boundaries
1) Convection currents in the mantle move the plates
2) 2 plates of oceanic crust diverge/pull apart e.g. North American and Eurasian plates.
3)
The rising magma forces the ends of the plate to push up and buckle.
This creates tensional cracks on the underside of the plates.
4) Magma is squeezed into the gap between the two plates and is cooled by the ocean to form new, solidified rock/basalt.
5) Rising magma forces its way through the tensional cracks and forms sub-marine shield volcanoes on the ocean floor.
6)
With repeated eruptions over millions of years they can grow until
they break the surface of the ocean and become volcanic islands e.g.
Iceland.
Answer:
c
Explanation:
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answered by aurinda
hope it helps:)
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