What is the earth's crust mostly made up of
- What is the earth's crust mostly made of
- What is the earth's crust mostly made out of
- What element is the earth's crust mostly made of
- What is the earth's crust mostly made of the land
- What rock is the earth's crust mostly made of
- What mineral is the earth's crust mostly made of
- The earth's crust is mostly made up of igneous rocks
- What type of rock is the earth's crust mostly made of
- Earth's crust is mostly made up of which 2 elements
- The earth's crust is mostly made up of what type of rock