appear and disappear. It is usually a slow and gradual process that occurs over thousand, even millions of years. Erosion begins with a process called wheathering. In this process, environmental factors break rock and soil into a smaller pieces and loosen them from the earth's surface. A chief cause is the formation of ice. As water freezes, it expands with great force. As a result, when it freezes inside the crack of a rock, it can break the rock apart...