The roots of grass can help preserve soil by keeping it in place - slowing the rate of erosion.
Soil can be eroded by rain, run off (gravity) or wind.
Soil that is not covered by grass or other plants has a higher rate of erosion, which will cause it to lose more minerals and make growing plants harder.
Soil that is eroding quickly can become unstable - causing small or severe problems such as inability to grow plants or landslides.
Rock cycle:
Rocks are weathered (broken down), eroded (transported) and the pieces are deposited in other areas.
The deposition causes rocks to form in other areas.
Erosion caused by water created the Grand Canyon.
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