Today, one of the core theories of geoscience is that the outer section of Earth, known as the lithosphere, is made up of tectonic plates - plates that interlock with one another and can shift. Geoscience has found that all earth-related processes, including volcanic activity and earthquakes, are affected by or are somehow related to the tectonic plates.
Geoscientists rely on many different tools and techniques to study the earth, including 2D and 3D tomography, resistivity imaging, and the use of special equipment that work in conjunction with electrodes to study the structures that are found beneath the earth's surface.
While geoscience may seem like a lofty type of science that has nothing to do with everyday people, the exact opposite is true. It's because of the various studies and imaging conducted by geoscientists that we are able to find oil wells and underground water sources, build bridges, and tentatively predict earthquakes and volcanic eruptions.
Engineers also rely on geoscience to help them with their jobs. Construction projects can't be executed without advanced knowledge of the surrounding ground and the formations found underground. Oil companies are unable to drill new wells or modify existing ones without knowing what's going on around the wells or drilling sites. And naturally forming salt compounds are commonly harvested to make road salt, which without we would have a much worse time at driving on the roads during icy weather.