Correct option is B
Sedimentary rocks are formed through the accumulation, compaction, and cementation of sediments derived from pre-existing rocks, organic matter, or mineral precipitation.
Key processes involved in their formation include:
- Destruction and Weathering: Breaking down of rocks into smaller particles by natural forces like wind, water, and temperature changes.
- Dissolving and Rainfall: Water dissolves minerals, aiding in the transportation and deposition of sediments.
- Lithification: The process by which sediments are compacted and cemented together over time to form solid rock.
Additional Information:
• Sedimentary rocks are typically formed in layers, called strata, often found in river beds, ocean floors, deserts, and lakes.
• Examples of sedimentary rocks include sandstone, limestone, and shale.
• These rocks often contain fossils, providing valuable information about Earth's history.
Other Options:
- Igneous rocks: Formed from the cooling and solidification of molten magma or lava, not from sedimentary processes. Examples: Basalt, Granite.
- Sub-metamorphic rocks: This term is not commonly recognized in geology. Likely refers to rocks undergoing minimal metamorphic changes but distinct from sedimentary processes.
- Metamorphic rocks: Formed through the transformation of existing rocks (sedimentary, igneous, or other metamorphic rocks) under high pressure and temperature. Examples: Marble (from limestone), Schist (from shale).
