External Forces Shaping the Earth


Erosion is caused by gravity, wind, water and ice. This clip shows what gravity and water can do to a massive hill side. Erosion can reshape landforms and Earths surface.

Glacier Erosion

A glacier moves because of gravity and is a large, long-lasting mass of ice. Glaciers form in mountainous areas and in regions that are  covered with heavy snowfall and ice. Giant pieces of ice and snow.

Glacier Moraine

Rocks left behind from a glacier that forms ridges or hills. Found on the sides, middle, or at the front of the glacier.

Wind Erosion

Transports and deposits sediment. The greater the wind speed, the larger particles that are able to be transported. Wind can make some unique rock formations.


Weathering alters landscapes and create different soil. Weathering is the physical and chemical changes of rock. Usually weathering doesn't occur quickly rather over many years.

Mechanical Weathering

Mechanical weathering breaks rock into smaller pieces. It does not change the composition of the rock only the shape. It is a physical change.

This picture depicts a rock that has under gone frost wedging.

Chemical Weathering

Chemical Weathering

Chemical weathering changes a rock into a new substance. It is a chemical change and an example would be

Water Erosion

Water Erosion from the Grand Canyon

Forms from water flowing in a stream. The current picks up loose sediment and moves it downstream. The water cuts into rock and forms canyons and amazing water ways.

Soil Factors

                               Scientists take into account 5 factors when they study Soil.

Parent Material-Chemical composition of parent rock

Relief-Steep slopes are eroded easily

Organisms-plants,small animals, bacteria...

Climate-differrent climates produce different soils

Time-average soil production is 2.5 cubic centimeters in a century


Loess is silt and clay that is blown in the wind. Loess produces fertile soil and is located all over the world.

By Luke DeVooght

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