Rocks
Rocks are made up of individual substances, called minerals, found mostly in solid state. Rocks are classified into three major types:
- Igneous Rocks are formed by the solidification of the molten magma, e.g., Mica, Granite etc.
- Sedimentary Rocks are formed due to accumulation of rock particles and organic matter in layers, under tremendous pressure, e.g., Gravel, Peat, Gypsum etc.
- Metamorphic Rocks were originally igneous or sedimentary but later changed due to pressure, heat or action of water, e.g., Gneiss, Marble, Quartzite etc.
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