Question

a. What are the three main types of sedimentary rock? b. Which type of sedimentary rock forms from the remains of living things? Explain how this sedimentary rock forms. c. What process causes deposits of rock salt to form? What type of sedimentary rock is rock salt?

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a. The three main types of sedimentary rock are clastic rocks, which are formed when rock fragments bind together; organic rocks, which are formed from the remains of living organisms that are deposited in rock layers; and chemical rocks, which are formed when the mineral solution crystallizes.

b. Organic rocks are formed from the remains of living organisms such as plants and animals. The process starts when the organic materials are broken down and buried on the surface of the ocean. Slowly, as the remains are accumulated on the sea floor, the decaying materials are pushed down further. After millions of years, these materials turn into coal.

c. Rock salt or halite, which is a crystalline mineral, falls under the chemical rock group. It is formed by the process of evaporation, wherein the saltwater (solution) is continuously heated until it dries up. As the water evaporated, it would leave salt crystals.

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