Mount Adams is a mountain range in the state of Washington that formed because of a crack in the earth. The crack allowed magma to seep through and over time it was built up forming the mountain range. Magma is still coming out of the earth of forming the mountain range more and more over time. I believe that if magma was to stop building up the mountain range that erosion and weathering would affect the mountains over many millions of years creating cliffs and steeper slopes on the side of the mountains.