a. Core, mantle, and surface

b. Core, mantle, and crust

c. Inner core, outer core, and mantle

d. Upper mantle, lower mantle, and crust

a. They travel at the same speed as light waves

b. They carry the same amount of energy as sound waves

c. They bend when they travel through different materials

d. They have the same wavelength as radio waves

Oceanic Crust

Continental Crust

North Pole

South Pole

a. Scalding

b. Cool

c. Molten

d. Lukewarm

a. About 60,000 kilometers

b. About 600,000 kilometers

c. About 600 kilometers

d. About 6,000 kilometers