Sedimentary rock may be formed from the shells of organisms containing calcium carbonate.

Name: Sedimentary rock may be formed from the shells of organisms containing calcium carbonate.
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Sedimentary rock can indeed form from the accumulation and compression of calcium carbonate-rich shells and other remains of marine organisms like corals, mollusks, and planktonic algae. This process is known as biogenic sedimentation, and it can result in the formation of limestones, chalks, and other carbonate rocks.

Sedimentary Rock May Be Formed from the Shells of Organisms