Why is the earth made up of different layers?

Answer 1

The Earth is huge relative to us. It is not even close to a heterogenious composition. The deeper you go, the higher the pressure gets from the weight of the ground on top of that point.

With higher pressure comes higher temperature. At around the mantle, under the crust (20-30mi deep) the temperature is much higher than the crust but the mantle is still fairly solid.

The temperature becomes so high when you get deep enough that the outer core is mostly liquid iron and nickel. The pressure at the inner core is so high that the iron and nickel are compressed into a solid.

Fun fact, the solid inner core has a radius about 70% of the moon's.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Leah Abbate

Because of differences in density and composition during formation, the Earth is divided into four layers: the outer core, inner core, crust, and mantle.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.