A group of scientists studied seismic waves and observed that the speed of seismic waves changes as they travel deeper into the Earth. Based on the scientists' observations, it can be concluded that Earth may have

Hey there.

Your answer (this is my guess) should be layers. I think this because the change in density of the layers from the inner core of the earth to its crust affects the speed of seismic waves.

So if the speed of seismic waves changed you can most likely deduce that the earth has layers.

If i am correct i would really like a .

massxgravity x heght=weightxheight= pe

4900=490xh

h=10