UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The crust is denser than the upper mantle.
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The crust is less dense than the upper mantle.
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Both the crust and upper mantle have the same density.
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No inference can be made about the densities of the two layers.
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Detailed explanation-1: -Since the crust floats on top of a liquid and flowing upper mantle, what inference can be made about the two layers? The crust is less dense than the upper mantle. No inference can be made about the densities of the two layers.
Detailed explanation-2: -The density will decrease with each layer as we move outward from the inner core. This is due to gravity. The denser something is, the more gravity will pull on it. So the densest materials are pulled closer to the very center of the Earth while less dense layers settle further away from the center.
Detailed explanation-3: -1. The layers of the solid Earth from least dense to most dense are: lithosphere, asthenosphere, mantle, outer core, inner core.
Detailed explanation-4: -The mantle, which contains more iron, magnesium, and calcium than the crust, is hotter and denser because temperature and pressure inside the Earth increase with depth.
Detailed explanation-5: -Earth’s crust “floats” on top of the soft plastic-like mantle below.