The Olympic Mountains in Washington state are made of sandstone, shale, and siltstone – rocks we expect to find on the seafloor. Explain how seafloor sedimentary rocks come to be found in the Olympic Mountains.

The Olympic Mountains in Washington state are made of sandstone, shale, and siltstone – rocks we expect to find on the seafloor. Explain how seafloor sedimentary rocks come to be found in the Olympic Mountains.

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