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Sedimentary Rock Part 1 By Matt Hopkins, David Irizarry, Larry Morrison, and Ben Beczynski #1: What is a sedimentary rock? What are the types? • A sedimentary rock is a rock that is formed by deposition of other small stones. The rocks eventually fuse together. • Examples of this are coal, iron ore, flint, and sandstone. #2: How do they differ from other rocks? • Sedimentary rocks are formed on the Earth’s layer. When weather and erosion wear down rocks. Bits and pieces of the rock fall off and become loose particles. Over time, weathering and erosion compact all the loose particles and rocks together to become one rock. #3: How can different sedimentary rocks differ in appearance? • Sedimentary rock can differ in ways such as fine grained, coarse layered, textured, grey, pink, white, powdery, and sandy textured. • From the outside layer of the rock, you can tell it consists of loose particles and rocks, which are packed together by weathering and erosion. Random Questions DO NOT CALL OUT • How is marble a sedimentary rock? Trick question – it’s not :P • Is obsidian sedimentary or metamorphic? Neither – it’s igneous