Answer:
1. 3 the earth is made up of three different layers: the crust, the mantle and the core. This is the outside layer of the earth and is made of solid rock, mostly basalt and granite. There are two types of crust; oceanic and continentil
2. no its only one its crust
3. Scientist rely on seismic waves shock waves generated by earthquakes and explosion that travel through earth and across its surface to reveal the structure of the interior of the planet
