About 75% of the Earth's surface
About 75% of the Earth's surface is covered by sedimentary rocks, which represent only 6% of the total rocks. These rocks originate from sediments resulting from the fragmentation or dissolution of other rocks, including small rock grains and remains of living beings, such as shells, or from substances dissolved in water. The deposition and compaction of these sediments form consolidated sedimentary rocks, held together by cement.
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