Did you know that geology of Gran Canyon have nearly 40 sedimentary rock layers? Imagine that sandwiches of rock ply. This is really a wonder geological sculpture. A must be one of the 7 world of wonders. This creation of mountains is caused by subduction - a process that takes place by which one tectonic plate moves under another tectonic plate, sinking into the Earth's mantle, as the plates converge. This event occur around 75 million years ago.
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