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Igneous Rocks Made from fire or heat Forms when volcanoes erupt and the liquid rock comes up to the earth's surface When the rock is liquid & inside the earth, it is called magma It cools very slowly and is very hard When the magma gets hard inside the crust, it turns into granite Most mountains are made of granite
Sedimentary Rocks Rock gets worn away due to erosion Rain, freeze/thaw cycle, wind and running water cause mountains to crumble, forming sediments Eventually most of the broken bits of the rock end up in the streams & rivers that flow down from the mountains sediments settle to the bottom of the lake or oceans they run into
Sedimentary Rocks Sedimentary rocks often have fossils in them. Examples: sandstone and shale
Metamorphic Rocks Originally igneous or sedimentary, but due to movement of the earth's crust changed Transformed by great heat or pressure Least common of the 3 kinds of rocks Example: Marble
The Rock Cycle Process that explains how rocks are constantly being formed, worn down and then formed again It takes thousands and millions of years for rocks to change. Weathering- the process of chemical or physical breakdown of the minerals in the rocks