Answer:
Geology's base is the interior of the Earth. If you remember from the Plate Tectonics section, plate tectonics is what caused the earth to look the way it does today. Additionally, we discovered the significance of plate tectonics in the production of mountains, volcanoes, and earthquakes. All of these, as well as the mechanisms that helped build the Earth and now regulate plate tectonics, can be discovered by studying the Earth's subsurface. Hence, it is really important to study the structure of our planet.
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