A few mountains result from the erosion of a thick pile of sedimentary rock. Which are they?
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lava are the thick pile sedimentary rock
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The Rocks that Make Up the Rockies
Many people, upon first seeing the Rockies assume they are made of very hard rocks like granite. They believe (mistakenly) that the mountains are either volcanic in origin, or that the rocks (like granite) had a molten genesis. With the exception of a few isolated pockets of igneous (formerly molten) rocks, the Canadian Rockies are composed exclusively of layered sedimentary rocks. These include limestone, dolomite, sandstone and shale, amongst others. Worldwide, sedimentary rocks cover approximately 75% of the worlds surface. Of this, approximately 50% are shales, 30% sandstone and 20% limestone.
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