Which rock type is formed by accumulation and compaction of particles?

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Multiple Choice

Which rock type is formed by accumulation and compaction of particles?

Explanation:
Sedimentary rocks form when particles produced by weathering and erosion accumulate in layers and are compacted and cemented over time. The weight of overlying sediments squeezes the grains together (compaction), and minerals precipitated from water bind the grains (cementation), turning loose sediment into solid rock. This buildup and lithification are what define sedimentary rocks, with examples like sandstone, shale, and limestone. In contrast, igneous rocks come from cooling molten material, while metamorphic rocks arise from existing rocks altered by heat and pressure; basalt is a common igneous rock formed from cooled lava.

Sedimentary rocks form when particles produced by weathering and erosion accumulate in layers and are compacted and cemented over time. The weight of overlying sediments squeezes the grains together (compaction), and minerals precipitated from water bind the grains (cementation), turning loose sediment into solid rock. This buildup and lithification are what define sedimentary rocks, with examples like sandstone, shale, and limestone. In contrast, igneous rocks come from cooling molten material, while metamorphic rocks arise from existing rocks altered by heat and pressure; basalt is a common igneous rock formed from cooled lava.

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