How Do Scientist Know About The Layers Of The Earth?

Scientists study how fast/slow earthquake waves move to tell the earth is made of layers. The waves go slower through rock than through liquid/goop.

Because of the seismic waves scientists were able to determine that there are different layers of the earth

They use a seismograph to measure the layers. They see how the seismic waves change speeds while they travel 2 the Earth. O.o

There are instruments that can see for them . Such as sonar ,x rays etc.

I think it is because of earthquakes

They study volcanoes and the the waves given out during an earthquake also give them some idea of how the earth is formed

Scientists go to place where there are volcanic eruptions. They take samples of lava and test what is in the magma.

Due to volcanos

Because when a plate slides under one another the older more dense plate slides under the younger less dense plate then magma rises beneath the more dense plate and a volcanic arc or a volcanic island arc forms.

You are so stupid you don't know
tell ms sweeney