<span>Landslides occur when masses of rock, earth, or debris move down a slope. Debris flows, also known as mudslides, are a common type of fast-moving landslide that tends to flow in channels.</span>
They begin as streams in mountains or hills
Yes , they are also very clean
The coolest layer is the crust. The crust is on the surface of the earth (where we are) . Inner Core
