A valley is a natural dip in the ground. Valleys run through hills, mountains, and flat areas of land called plains. Valleys are found on the ocean floor, too. Some valleys are narrow, and some are wide. Rivers and streams often flow through valleys. Many valleys have good soil for farmland.
Most valleys form when the running water of a river wears away the earth along its banks. A slowly moving sheet of ice called a glacier <<GLAY shuhr>> can scrape out a U-shaped valley in mountains. A rift valley may form when part of Earth’s crust sinks.