Question

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








A.
They have learned the precise depths where the boundaries between the earth's layers are located.







B.
The outer core of earth is solid.







C.
Earth's mantle is liquid.







D.
The inner core of earth is liquid.
d?

Answer 1

No
Seismic waves travel fast, on the order of kilometers per second (km/s). The precise speed that a seismic wave travels depends on several factors, most important is the composition of the rock. We are fortunate that the speed depends on the rock type because it allows us to use observations recorded on seismograms to infer the composition or range of compositions of the planet. But the process isn't always simple, because sometimes different rock types have the same seismic-wave velocity, and other factors also affect the speed, particularly temperature and pressure.

Answer 2

a?

Answer 3

Yep

Answer 4

thx