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1. igneous rocks: formed by the cooling and hardening of magma (molten rock) from inside Earth. 2. sedimentary rocks: formed by the compaction and cementing of layers of sediment (rock fragments, plant and animal remains, minerals from water) 3. metamorphic rocks: formed by the effect of heat and pressure on other rocks. *Earthâs crust is made-up primarily of igneous rocks.
Sedimentary rock is rock that is formed in layers by the depositing and pressing of sediments on top of each other. Sediments are any loose material that gets broken away and carried: pieces of rocks, pebbles, sand, clay, silt, boulders, dead organisms, animals, plants, shells, insects. . . .hen, over a long time, layers and layers of sediments get deposited on top of each other, the weight of the top layers presses down on the bottom layers, forming them into rock called sedimentary rock. The oldest layers are on the bottom, and the youngest layers are on the top.