Earth's Layers

What are the four main layers of the Earth called?

What is the temperature of the inner core, and why is it significant?

Which layer of the Earth is the outermost, and what is its main characteristic? How can the inner core be solid even at high temperatures?

About how thick is the Earth's crust on average?

What materials mainly make up the Earth's mantle?

Describe what the outer core is like in terms of state and composition.

Why is the inner core solid despite being extremely hot?

How do scientists learn about what's inside the Earth?

What process in the mantle affects tectonic plate movement?

Which layer is responsible for generating Earth's magnetic field?