Consider the following pairs with reference to sedimentary rocks and the process of their formation: 1. Chert — Chemically formed 2. Geyserite — Organically formed 3. Shale — Mechanically formed Which of the pairs given above is/are correctly matched?
D. 1, 2 and 3
Sedimentary rocks are classified into three major groups based on their mode of formation: 1. Chemically formed: These rocks are formed by the precipitation of minerals from water. Examples include chert, limestone, halite, and potash. Thus, pair 1 is correctly matched. 2. Organically formed: These rocks are formed from the accumulation of plant and animal debris. Examples include geyserite, chalk, limestone, and coal. Thus, pair 2 is correctly matched. 3. Mechanically formed: These rocks are formed from the mechanical weathering of pre-existing rocks, followed by transportation and deposition. Examples include sandstone, conglomerate, limestone, shale, and loess. Thus, pair 3 is correctly matched. All three pairs are correctly matched. Answer: 1, 2 and 3
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