Rocks and their formation
- Created by: squeaky biscuit
- Created on: 26-11-14 18:24
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- Rocks and their formation
- Igneous rocks
- E.g. Granite
- are formed by the solidification of magma/lava.
- are made of crystals whose size depends on the rate of cooling.
- The quicker it slows down the smaller the crystals. (The slowest always wins).
- Sedimentary rocks
- E.g. chalk and limestone
- are formed when layers of sediment are compacted over a long time by being buried under more layers.
- erode more easily than igneous and metamorphic rocks.
- are made of rounded grains and may contain fossils.
- Metamorphic rocks
- E.g. marble
- They are formed by the action of heat and/or pressure
- including the formation of marble from chalk or limestone
- Limestone, chalk and marble exists in the Earth's crust and they are all natural forms of calcium carbonate.
- song about types of rocks
- Igneous rocks
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