Question

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

A.
The inner core of earth is liquid.

B.
There are no finite boundaries between the layers. They mesh into one another.

C.
The layers of the earth increase in density as one moves toward the earth's center.

D.
The crust of earth is liquid.

Answer 1

help

Answer 2

i think c

Answer 3

C