The document discusses key concepts about ecosystems and natural resources. It defines the water cycle as the continuous cycle that water takes as it moves between water vapor, ground water, runoff, and other states. It also distinguishes between renewable resources like water that can be renewed, nonrenewable resources that cannot be renewed, and inexhaustible resources like wind and water that will not run out. The document was produced by Pierce Burtis and presented as a science project.
![Water cycle ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)