Which rock is an example of sedimentary rock?

Which rock is an example of sedimentary rock?

• A. Sandstone
• B. Granite
• C. Marble
• D. Basalt

Answer: (A)

Rocks are classified by how they form. Sedimentary rocks come from particles weathered from other rocks that settle out, accumulate, and are pressed together over time. Sandstone fits this pattern: it forms from sand-sized grains that settle in environments like rivers, beaches, or deserts and become cemented into rock through lithification. The other options come from different processes: granite is an igneous rock that forms when molten rock cools and solidifies, basalt is also igneous from lava, and marble is metamorphic, formed when limestone is altered by heat and pressure. So sandstone is the sedimentary example because its origin is the deposition and cementation of sediment.