Which have scientists learned from studying seismic waves that travel through earth’s interior?

a. the outer core of earth is solid.

b. they have learned the precise depths where the boundaries between the earth's layers are located.

c. the inner core of earth is liquid.

d. earth's mantle is liquid.

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

have a great day!

i think they are all correct

explanation:

they seem good