The atmosphere and Earth's interior are layered by density. Gravity pulls more strongly on denser materials so denser materials are at the center of things. Earth's core, at its center, is denser than its crust.
Hi pupil here's your answer ::
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This is due to the inertia of motion that the Blades of an electric fan continue to rotate for some time even after the fan has been switched off.
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Hope this helps .......
Because of genetic variation
The largest mountains on the continents are formed by stress deformation.
This is also know as strain, which is a process that occurs when the intensity of the stress is greater then the internal strength of the rock. This kind of activity, forming of mountains, occurs when to tectonic continental plates with same densities are colliding, so under the pressure, stress, they create, the area of collision is lifting up.
The answer is d because our oceans are our unique features because we have permanent liquid water.