Earthquakes and Explosions casue Seismic Waves:
When there is an earthquake somewhere, it porduces seismic waves that travel out through the Earth. We can detect these using seismometers.
Seismologists work out the time it takes for the shock waves to reach each seismometer.
There are two different types of waves you need to learn = P WAVES AND S WAVES.
They can travel through solids and liquids. They travel faster than S-waves.
They can only travel through solids. They're slower than P-waves.
When the waves reach a boundary between different…