Water covers more than 70% of the Earth's surface, providing plenty of material for hydrologists, the scientists who research how water moves through and through the Earth's crust. They handle difficulties in order to improve water quality and boost water availability. A hydrologist's primary responsibilities include evaluating the qualities of bodies of water, collecting and testing water samples, and analysing the effects of pollution, erosion, and drought. They anticipate future water levels using complex computer algorithms and sensing equipment, and they may supervise people who run the equipment. Hydrologists also assess the feasibility and impact of projects like hydroelectric dams and irrigation systems before reporting their findings and suggestions. Groundwater hydrologists, for example, examine water beneath the earth's surface and plan cleaning of contaminated groundwater from chemical spills, or they advise on safe well location. Hydrologists typically work both in an office and in the field. Hydrologists in the field may gather samples and inspect equipment while knee-deep in lakes and streams. Many vocations necessitate extensive travel. Most hydrologists work full-time, but shift lengths may vary in the field. Hydrologists must have a bachelor's degree or above, and some occupations require a master's degree. A Ph.D. is often required for advanced research and university faculty posts.