What is the purpose of the following figure? 
Definitions:
Erosion
Erosion is the natural process by which soil, rock, and other surface material are worn away and transported by natural forces, such as water or wind.
Condense
To reduce something, such as a text or statement, to make it shorter, while retaining the essential information or to change the physical state of a substance from gas to liquid.
Precipitation
The process by which water in the form of rain, snow, sleet, or hail falls from the atmosphere to the Earth's surface.
Root Systems
The underground part of a plant that absorbs water and nutrients from the soil, anchors the plant, and stores food.
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