ROCKS

In geology, a rock is a naturally occurring solid aggregate of one or more minerals or mineraloids. The Earth's outer solid layer, the lithosphere, is made of rock.

• Rocks have been used by humans for millions of years, from early tools and weapons through to various construction materials.
• There are three different types of rocks based on the way they form, igneous, sedimentary and metamorphic.
  
• When magma cools and solidifies it forms igneous rock. Examples of igneous rocks include granite, basalt, gabbro, obsidian and pumice.
• Sediment deposited over time, often as layers at the bottom of lakes and oceans, forms sedimentary rocks. Examples of sedimentary rocks include sandstone, mudstone, flint, greywacke and chalk.
• Extreme pressure and heat over time forms metamorphic rocks.Examples of metamorphic rocks include marble, quartzite, schist, granulite and slate.
• The metamorphic rock marble is formed from the sedimentary rock limestone.
  
• The metamorphic rock granulite is formed from the igneous rock basalt.

 

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