The two types of evidence use to learn the earth’s interior are:
- Direct Evidence (Rock Samples) - Geologists drilled holes into the Earth as much as 12 kilometers that brings them samples of rock. From these samples, they can make inferences about the Earth’s interior condition where these rocks formed.
- Indirect Evidence (Seismic Waves) - by recording the seismic waves the earthquakes produce helped the geologists study how seismic waves travel through the Earth and the path they take reveal the structure of the Earth.
