what are the rock made up off
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What are the rock made up off?
Rocks form when melted rock cools into a solid. This can happen underground, where liquid rock is found in the form of magma, or above the ground, where lava is released during a volcanic eruption. Common examples of igneous rocks include granite, basalt, pumice, and obsidian.
While igneous rocks can form in a matter of minutes as lava erupts and cools quickly on Earth's surface, sedimentary rocks can take millions of years to form. When soil and surface materials erode over time, they leave layers of sediments.
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