They study the structure, composition, size and history of the universe. Geology investigates the composition, structure, and history of the earth. Geologists analyze how such forces as earthquakes, volcanic eruptions, and wind or water erosion change the earth's surface. Economics examines how people produce goods and services, how goods and services are distributed and how they are used. Political science studies forms of government, political parties, pressure groups, elections and other aspects of politics.
Psychology involves investigation of mental processes and behavior.
Physiological psychologists study how the nerves and the brain work. They use systematic methods to examine people's thoughts, feelings and personality traits. Science is needed by everyone in some way and that is why science is important. Science is important because of predictions. If someone knows that something bad will happen, like an earthquake, they could save a lot of lives.