Minerals and Rocks
Concept: Some Rocks and their Uses
We know that rocks can be broadly classified into—igneous rocks, sedimentary rocks and metamorphic rocks. Each of these categories includes different types of rocks. Let us have a detailed look at them.
Igneous rocks:
1. Granite
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2. Pumice:
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3. Obsidian:
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4. Basalt:
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Sedimentary rocks:
1. Sandstone:
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2. Shale:
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3. Conglomerate:
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4. Limestone:
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Metamorphic rocks:
1. Marble:
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2. Slate:
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3. Gneiss:
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4. Quartzite:
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New Words:
Cemetery: A place where dead people are buried
Acidity: The amount of acid in a substance. Acid is a substance that tastes sour.
Neutralise: To balance the effect of acidity.
Did You Know?
- Rocks are found in some things that we use at home like soaps, toothpaste and batteries.
- The use of rocks started millions of years ago when the early men used them to make weapons and produce fire.
- Diamond is the hardest substance known on earth and mainly comprises carbon.
- Ruby and Sapphire used as precious gems are varieties of a mineral named Corundum.
- The metamorphosis of Limestone forms a type of metamorphic rock called Granulite.