||Any area of land with specific natural features.
center part of the Earth.
||A specific area of the earth that falls between the core and the crust.
||The specific gas that surrounds the earth.
||The outer layer of the earth's surface.
treat (waste products) for reuse or so as to recover reusable materials.
||Large areas of salt water that surround much of the earth's surface.
||A type of oxygen that is produced by electricity and is in the air, mostly after a thunderstorm.
||The made up line around the earth that shows how far the North and South poles are.
||The central like the earth revolves around.
||A prolonged period of time without rainfall.
||The process of moving around a center or axis.
||The gradual process of being eroded by natural forces.
||The act of rotating around a center or axis.