Which rock type forms from the remains of plants and animals pressed and cemented together?

Which rock type forms from the remains of plants and animals pressed and cemented together?

• A. Sedimentary Rock
• B. Igneous Rock
• C. Metamorphic Rock
• D. Limestone

Answer: (A)

Sedimentary rocks form when layers of sediment, including organic material like plant and animal remains, are deposited, buried, and become solid through compaction and cementation. Over time, weight squeezes the sediments and minerals dissolved in water precipitate, acting as a cement to bind the grains into rock. The description of remains being pressed and cemented fits this process directly, making sedimentary rock the best match. Igneous rocks come from melted material that cools, and metamorphic rocks form when existing rocks are altered by heat and pressure, so they don’t fit the described formation method. Limestone is a specific type of sedimentary rock, often from shells and skeletal material, but the broader category captures the stated formation process.

Sedimentary rocks form when layers of sediment, including organic material like plant and animal remains, are deposited, buried, and become solid through compaction and cementation. Over time, weight squeezes the sediments and minerals dissolved in water precipitate, acting as a cement to bind the grains into rock. The description of remains being pressed and cemented fits this process directly, making sedimentary rock the best match. Igneous rocks come from melted material that cools, and metamorphic rocks form when existing rocks are altered by heat and pressure, so they don’t fit the described formation method. Limestone is a specific type of sedimentary rock, often from shells and skeletal material, but the broader category captures the stated formation process.