Hydrologists are scientists who study the movement, circulation, and distribution of water through the earth’s crust. They measure and analyze the quantity and quality of water in various forms from rivers to dams, from aquifers to sewage supplies. They work to better understand and conserve this natural resource. Their work includes collecting water samples, determining pollution levels, pH levels, planning strategies for water preservation, and overall water management. They work in alliance with other environmental scientists and professionals. Within hydrology, there are further specializations like marine hydrology, groundwater hydrology, surface water hydrology, etc.