Land Forms There are many land forms: Mountains, rivers, beaches, canyons... Land Forms Land Forms are created by inside forces of the earth: uplifting, earthquakes, volcanoes. Land Forms Land Forms are also created by outside forces of the earth: weathering and erosion. Uplift A process that moves the surface of the earth to a higher elevation. Uplift The Himalayas Were created by uplifting. The Himalayas are still getting taller! Uplift Mountain A mountain is the highest kind of land form. A mountain has a peak. Plateau When a large flat area is uplifted. An example of a plateau is a mesa. Weathering The destructive process that breaks down rocks into sediment. Weathering Weathering breaks rocks by freezing and thawing. Weathering This rock has been weathered down. erosion The process of moving weathered material or sediment from one location to another. erosion uses water, wind, ice and gravity to break apart rock.. Weathering and erosion will change mountains into plains. Sediment/plain Plain A plain is flat land. Valley A valley is low land between hills or mountains. Glaciers Glaciers carved a U-shaped valley in California’s Yosemite park. Glacier Rivers and streams will carry rock fragments down the mountain. Rivers usually carve sharp, V shaped valleys and canyons. As the river gets to flat land, it will slow down and begin to create meanders. A meander is a turn or river bend. Eventually the river will find a straighter path and create an oxbow lake. This is how an oxbow lake is created. During heavy rains, the river will become flooded. Flood Plain You get the most deposit left behind after a heavy rain or flood. Flood Plain As the rocks travel down the river, they will get smaller and smaller. Rivers also create canyons. canyons •The Colorado River is responsible for creating the Grand Canyon. Delta •Rock or sediment deposits at the end of a river. Beaches are temporary deposits of grain sized rocks, sand. •The waves wash away the sand. Sand must be added constantly or the beach will disappear. What would happen to the beaches if we block all the rivers?