What are the four main parts of soil?

inorganic minerals, organic matter, water, and air.

Explanation:

inorganic mineral matter, about 40 to 45 percent of the soil volume.organic matter, about 5 percent of the soil volume.water, about 25 percent of the soil volume.air, about 25 percent of the soil volume.

Geologists use  seismic waves to  locate an earthquake's epicenter..