UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The upper mantle and the crust have different ages.
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The upper mantle and the crust have different masses.
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The upper mantle and the crust have different densities.
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The upper mantle and the crust have different suns.
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Detailed explanation-1: -The differentiation between these layers is due to processes that took place during the early stages of Earth’s formation (ca. 4.5 billion years ago). At this time, melting would have caused denser substances to sink toward the center while less-dense materials would have migrated to the crust.
Detailed explanation-2: -Planetary differentiation is the separation of different constituents of planetary materials resulting in the formation of distinct compositional layers. Denser material tends to sink into the center and less dense material rises toward the surface.
Detailed explanation-3: -Planetary differentiation is the process by which planetary interiors organize into layers of different densities. The Moon was originally a mixture of materials ejected by the giant impact that created it; a major period of planetary differentiation occurred early in its history.
Detailed explanation-4: -Heat of formation, combined with radioactive decay of elements in the planet, resulted in differentiation.