San+Juan+Mountains+2A

The San Juan Mountains  By Dzifah D. Elijah A. Prescott P. Jeremiah S.  The San Juan Mountains have been reshaped all over the years they have been here in Colorado. All the agents like have cut and stripped the mountains to what they are now. Weathering and Erosion have also taken part in shaping the San Juan Mountains. These mountains are located in between Durango and Montrose, Colorado. Lava has also taken part in this billion year mountain shaping. All these agents and forces have done a lot in the years of all the forming these amazing mountains. People like to hike these mountains in the summer. The San Juan Mountains have many constructive forces. The main constructive forces are volcanoes. Volcanoes are constructive because they erupt repeatedly. The lava hardens each time volcanoes erupt, and gets bigger each time. Over a while of volcano eruptions up to fifteen calderas were formed. Calderas are holes in a where a volcanoes used to be. The San Juan has the three main rocks in them, igneous, metamorphic, and sedimentary rock. There is a lot of sedimentary rock on the mountain the different types of rock are compressed together to make the sedimentary rock. A majority of the rock is volcanic rock. Those are the many constructive forces in the San Juan Mountains.

The San Juan are very rugged because of weathering and erosion. A long time ago, the mountains were covered by glaciers which eroded the glass like rock called tuff, and left U-shaped valleys. Erosion is still happening today due to frequent landslides. Another kind of erosion is caused by rock glaciers, which are creeping slowly down the mountains. For an example: like when snow or water gets in cracks it expands and wall it is doing it the crack get bigger and bigger and then It breaks down and piece falls off! cool sit for wethering and all sots of stuff  []