The difference among Igneous rocks sedimentary rocks and metamorphic rocks
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Igneous rocks
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Sedimentary rocks
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Metamorphic rocks
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1. Formed by solidification of molten magma on cooling.
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1. Formed by the consolidation of sediments.
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1. Formed by subsequent transformation igneous and sedimentary rocks.
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2. It may be called primary rocks because it formed first.
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2. It is derived from the breaking down of primary rocks.
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2. It is derived from the breaking down of primary and secondary rocks.
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3. Igneous rocks consist mainly of primary minerals of which quartz, feldspar’s, amphiboles, pyroxenes, and mica are the most common.
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3. Sedimentary rocks consist mainly of secondary minerals together with some qualities of primary minerals, such as limestone, sandstone, siltstone, shale, calcareous sandstone, arenaceous limestone, etc.
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3. Metamorphic rocks consist of mainly granite, shales, limestone, sandstone, etc.
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4. No action of water, glacier, and wind is taken place.
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4. The action of water, glacier, and wind is taken place.
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4. Influenced by heat, pressure, and gasses.
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5. They have no layer so they called unstratified rocks.
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5. They have layers so they called stratified rocks.
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5. They may be layered or no layered.
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6. These rocks are often shiny and glossy.
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6. These rocks are soft looking and can contain fossils.
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6. These rocks are hard and often contain crystals.
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7. Example: Granite, gabbro, basalt, etc.
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7. Example: Sandstone, siltstone, shale, etc.
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7. Example: Marble, slate, gneiss, quartzite, etc.
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