How was the inside of the Earth mapped out? For example, how do we know the thickness of the crust? Question 3 options: By using data from earthquakes (seismic waves) By using data from meteorites We do not know the thickness of each layer of the Earth By digging into the earth with large augers

The seismic waves are generated during an earthquake and it plays an important role in understanding the interior of the earth. The behavior of these waves at different depths changes due to the influence of density, rock composition, pressure, and temperature conditions. These seismic waves are divided into P and S waves.

The P waves are the primary waves characterized by contraction and expansion. This wave travels at a faster speed compared to the S waves. The P waves can travel both in solid as well as liquid. The S waves are secondary waves or shear waves that can move only in solid.

The P waves are reflected and refracted at the core-mantle boundary, and further travels towards the interior of the core. Whereas when the S waves reach the core-mantle boundary, it gets absorbed. They cannot travel in liquid.

Due to these changes in the seismic waves that occur in the core-mantle and crust-mantle boundary, the different layers of the earth's interior were identified and their thickness was able to measure.

Thus, the earth's interior layers and their thickness were determined by using the data obtained from earthquakes (seismic waves).

Hence, the correct answer is option (1).