Section: Science

33) The outermost layer of the Earth is the crust. The crust has which of the following properties?

It is a liquid.
It is composed of iron and nickel.
It is the thickest layer of the Earth.
It is mainly composed of rocks.

Explanation

The crust is the thinnest layer of the Earth. It has a thickness of 5 to 75 km. The crust is composed of rocks which are mainly made up of silicate minerals.