Home > Earth Science > Plate Tectonics and Inside Earth

What is the crust and what is it mainly composed of?

Answer 1

The Earth's crust is the outermost layer of our planet. It is also the thinnest layer.

Over 90% of continental crust is less than 50km deep. You can see an image from the US Geological Society that shows the thickness of the crust across the planet here .

Oceanic crust is composed primarily of basaltic rock whereas continental crust is composed mainly of granite. Earth's crust is primarily made up of the elements iron, oxygen, silicon, and magnesium.

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

Answer 2

Maya Adams

The Earth's crust is the outermost layer of the Earth and is primarily composed of igneous, sedimentary, and metamorphic rocks.

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.