Question

fill in the blanks to complete the passage.
geologists can use \boxed{} 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 \boxed{} core is liquid.
geologists call the outer, solid area of earth the crust; the next layer is the \boxed{}. finally, at the very center, is the core.

Explanation:

1. Geologists use seismic waves (P and S waves are types of seismic waves) to study Earth's interior.
2. S waves can't travel through liquid, so the outer core being liquid is deduced from S - wave behavior.
3. Earth's layers after the crust is the mantle, then the core (with outer core liquid and inner core solid).

Answer:

First blank: seismic; Second blank: outer; Third blank: mantle