Question

earthquakes help scientist figure out what is inside the earth. how did they determine that the earth is divided into different layers?

a. seismic waves speed up as it travels deeper.
b. one kind of wave disappears as it reach the core.
c. waves are refracted or reflected at certain depth.
d. all of these​

Answer 1

Explanation:

Except in the crust, the interior of the Earth cannot be studied by drilling holes to take samples. Instead, scientists map the interior by watching how seismic waves from earthquakes are bent, reflected, sped up, or delayed by the various layers.