Rock is a naturally occurring solid aggregate of one or more minerals or mineraloids. For example, the common rock, granite, is a combination of the quartz, feldspar and biotite minerals. The Earth's outer solid layer, the lithosphere, is made of rock.The scientific study of rocks is called petrology. 10 cool facts about rocks 1.The three types of rock found on the earth are sedimentary,Igneous and metamorphic rocks. 2.Molten rock below the earth's surface is called magma. When molten rock is expelled from a volcano,it's called Lava. 3.The earth's surface is made up of massive slabs of rock known as plates.The scientist called it as tectonic plates. When the plates move and collide,they can form mountain ranges and even cause earthquakes . 4.Generally we have a thought that rocks are hard.But it is not true. Most rocks are hard but not all of them .Some rocks such as those made up of the mineral calcite,are soft enough to scratch with your fingernail.
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