Consider the following statements regarding sedimentary rocks: (UPSC 2001)1. Sedimentary rocks are formed at the earth's surface by the hydrological system.2. The formation of sedimentary rocks involves the weathering of pre-existing rocks.3. Sedimentary rocks contain fossils.4. Sedimentary rocks typically occur in layers.Which of the statements given above are correct?
✓ Correct answer: d) 1, 2, 3 and 4
ExplanationAns: D Exp:Statement 1 is correct: Sedimentary rocks are primarily formed at the Earth's surface through the process of sedimentation, which involves the deposition and subsequent compaction of mineral and organic particles.This process is closely tied to the hydrological system, which includes the movement of water in various forms such as rivers, lakes, oceans, and even wind-driven processes.Statement 2 is correct: The parent rocks that undergo weathering can be igneous, metamorphic, or even other sedimentary rocks.Weathering processes break down these rocks into smaller particles, including minerals and organic material.Statement 3 is correct: Sedimentary rocks are associated with fossils, which are the preserved remains or traces of once-living organisms.Fossils are critical for understanding past life forms, environments, and the Earth's history.The process of fossilization typically involves the rapid burial of organic material in sediment, preventing decay and promoting preservation.Statement 4 is correct: One characteristic feature of sedimentary rocks is their tendency to occur in distinct layers, known as strata.Each layer represents a different episode of deposition and can provide valuable information about the geological history of an area.These layers may vary in composition, grain size, and color, reflecting changes in environmental conditions over time.
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