Geoscientists study the composition, stucture and other phyical aspects of the Earth. Geoscientists usually study and are subsequently classified in one of several closely related fields of geoscience, including geology, geophysics and oceanography.
Geologists study the composition, processes and history of the Earth. They try to find out how rocks were formed and what has happened to them since formation. They also study the evolution of life by analyzing plant and animal fossils.
Geophysicists use the principles of physics, mathematics and chemistry to study not only the Earth's surface, but also its internal composition; ground and surface waters; atomosphere; oceans; and its magnetic, electrical and gravitational forces.