Give reasons:-
(1)Change in pre-existing rocks into a new form.
(2)Sedimentary rocks are layered.
(3)Igneous rocks are called hard rocks.
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1) Metamorphism is the addition of heat and/or pressure to existing rocks, which causes them to change physically and/or chemically so that they become a new rock. Metamorphic rocks may change so much that they may not resemble the original rock.
2)Siliciclastic sedimentary rocks are subdivided into conglomerates and breccias, sandstone, and mudrocks. Carbonate sedimentary rocks are composed of calcite (rhombohedral CaCO.
3) Igneous rocks are formed from molten rock called magma. They are mostly crystalline (made up of interlocking crystals) and usually very hard to break.
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