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Describe the characteristics and types of primary rocks. ( 150 words ) [UPSC 2022]
Primary Rocks are also known as Igneous Rocks. The word Igneous is derived from the Latin word 'Ignis', which means 'fire'. Igneous rocks are formed when hot and liquid magma beneath the surface cools down and becomes solid. These rocks are dominated by silicate minerals containing iroRead more
Primary Rocks are also known as Igneous Rocks.
The word Igneous is derived from the Latin word ‘Ignis‘, which means ‘fire‘.
Igneous rocks are formed when hot and liquid magma beneath the surface cools down and becomes solid.
These rocks are dominated by silicate minerals containing iron and magnesium.
All other types of rocks are formed from igneous rocks.
Examples of Igneous Rocks –
Granite, basalt, pegmatite, gabbro are examples of igneous rocks.
Metamorphic and sedimentary rocks are directly or indirectly related to these.
During volcanic eruption, the gaseous portion coming out of the earth dissolves into the atmosphere.
This gasless magma is called lava.
Types of Igneous Rocks –
There are mainly two types of Igneous Rocks.
1. Intrusive Igneous Rocks
2. Extrusive Igneous Rocks
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