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Shatter masters1/7/2024 ![]() Geophysical anomalies: variations in gravity and/or magnetism that stand out as “unusual”Ĥ. Craters, or geology that indicates the presence of a craterģ. Evidence of rocks that have been changed by shock waves (shatter cones)Ģ. So, in order to find impact craters scientists search for the following clues.ġ. On Earth there are many processes that wear away or hide the craters, including erosion, vegetation, seafloor sediments, lava, and plate tectonics. Unlike the surface of the Moon where impact craters dominate the surface, most of Earth’s craters are much more difficult to identify. Scientists have identified over 160 impact craters on Earth. The presence of shatter cones here puzzled scientists because the area lacked visible evidence and other characteristics typically associated with impact craters. Right: This photo, which was provided by Mike Plautz, Science teacher at Hellgate Elementary in Missoula, shows a classic shatter cone at a location scientists refer to as the "Beaverhead Site”. They recognized that these were “shatter cones” the unique fracture patterns formed as intense shock waves generated by an asteroid impact travel through bedrock. The team found rocks with distinct cone-shaped fracture patterns resembling horsetails. In 1990 geologists discovered evidence of an ancient asteroid impact in the mountains of southwestern Montana. Shock Wave Frozen in Stone on Rim of Impact Crater Montana's Earth Science Picture of the Week
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