Answer:Rocks are made up of minerals. They can be all one kind of mineral, for example sandstone which is made of sand or they can made of many different types of minerals like granite. Rocks form the Earth's crust and include the surface forms we see every day.
Step-by-step explanation:
To geologists, a rock is a natural substance composed of solid crystals of different minerals that have been fused together into a solid lump. The minerals may or may not have been formed at the same time. What matters is that natural processes glued them all together
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