Summarize how rocks, fossils and climate provided evidence of continental drift. Wells, H. G., Huxley, J. 6. Mountains are typically formed when two opposite land masses collide with each other triggering the rock found at the point of collision to fold or bulge upwards. Subduction zones are where subduction takes place. What is a Sand Dune: Formation and Types of Sand Dunes, Tropical Rainforest Biome: Climate, Precipitation, Location, Seasons, Plants and Animals, Copyright 2023 Earth Eclipse . Some explained this as part of the normal movement of earth magnetic north pole. Rocks on different continents that are the same age point to different locations. The two paths merge into one if the continents are allowed to drift. This finding supported the idea that the seafloor was not fixed in one place [17]. Possibly the most important fossil evidence found is the plant, Glossopteris. It makes a much-cooled rock layer that should be solidifying into the crust. There has only been one magnetic north pole and the continents have drifted (figure 7). When an oceanic and a continental plate collide, eventually the oceanic plate is subducted under the continental plate due to the high density of the oceanic plate. The discovery of fossils on different continents indicated that the continents were once together before they drifted away. Sobolev and Brown found that two major periods of worldwide glaciation, which resulted in massive deposits of glacier-scrubbed sediment, each likely caused a subsequent boost in the global rate of plate tectonics. This would tell them where magnetic north was at the time the rocks cooled. Almost all plate movement occurs in boundaries which lie between different plates. Chris Johnson, Matthew D. Affolter, Paul Inkenbrandt, & Cam Mosher. WebContinental Drift is the slow movement of the continents across the earths surface through geographical time. What happens when a continental plate and oceanic plate collide? 1. Instead, a collision between two continental plates crunches and folds the rock at the boundary, lifting it up and leading to the formation of mountains and mountain ranges. Contact Us . Tolstoy, I. This evidence for continental drift gave geologists renewed interest in understanding how continents could move about on the planets surface.
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