Fill in the blanks to complete the passage.

Question

Geologists can use
waves to learn about Earth’s interior. P waves travel faster than S waves. S waves travel through solids only, which tells geologists that the
core is liquid.

Geologists call the outer, solid area of Earth the crust; the next layer is the
. Finally, at the very center, is the core.

Answer 1

Geologists can use seismic waves to learn about Earth’s interior. P waves travel faster than S waves. S waves travel through solids only, which tells geologists that the outer core is liquid.

Geologists call the outer, solid area of Earth the crust; the next layer is the mantle. Finally, at the very center, is the core.