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Manicouagan impact structure, Manicouagan RCM, Côte-Nord, Québec, Canada : A meteorite impact crater. The structure was created 214 (±1) million years ago, in the Late Triassic, by the impact of a meteorite 5 km in diameter. Wikipedia gives the width as 100 km, but . ....
Jon Wade, Associate Professor of Planetary Materials at the Department of Earth Sciences, University of Oxford, said: “The initial amount of rion in Earth’s rocks is “set” by the conditions of planetary accretion, during which the Earth’s metallic core segregated from its rocky mantle. “Too little iron in the rocky portion of the planet, like […] ....