History of Science
Rocks and Minerals
How big are erratic boulders?
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Asked in Earth Sciences
What is the name of boulders left behind by a retreating glacier?
Asked in Geology
What does the existence of erratic boulders suggest about an area?
erratic boulders means that a glacier passed over this area. The boulders may have been the side of a mountain or part of a cliff but the power of the glacier broke it down and off and then moved it. When the glacier receded, the boulders were left behind. They are often found in areas where there are no mountains or cliffs...they are geologically different from the bedrock. Geologists can often match erratic boulders up with their place of origin which may be many miles away. They range in size from stone size to house size.