RHNC+6.1

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 * 6.1 exploring earth's surface**

Vocabulary

 * topography-**it is the shape of the land.
 * elevation-**the height above sea level of a point on earths surface.
 * relief-**the difference in elevation between the highest and lowest points of an area.
 * landform-**it is a feature of topography formed by the processes that shape the earths surface.
 * landform region-** a large area where the topography is similar.
 * plain-**is a landform made up of flat or gently rolling land with low relief.
 * mountain-**is a landform that has high elevation and high relief.
 * plateau-**is a landform that has high elevation and a more or less level surface.
 * lithosphere-**earth's solid, rocky outer layer.
 * atmosphere-**is the outer most sphere with a mixture of gases that surround the earth.
 * hydrosphere-**it is formed by earth's oceans, lakes, rivers, and ice.
 * biosphere-**it is formed by all living things in the air, ocean, and on land.