Answer» Correct Answer - Option 4 : Granite
The correct answer is Granite. - Igneous rocks are the most basic type of rocks. They are formed when magma (molten rock, typically derived from the earth's mantle) solidifies.
- This can happen beneath or above the surface, resulting in 2 subtypes:
- Plutonic rocks
- Volcanic rocks
- Plutonic rocks:
- When magma never reaches the surface and cools to form intrusions (dykes, sills, etc) the resulting rocks are called plutonic.
- Granite is an example of Plutonic rock.
- Volcanic rocks:
- When magma does reach the surface during a volcanic eruption, the rocks that form there are called lavas or volcanic rocks.
- Sedimentary rocks:
- Rocks that are formed by the consolidation of sediments of Pre-existing rocks under the mechanical, chemical, or organic activities of the wind, running water, etc are sedimentary rocks.
- Metamorphic rocks:
- Rocks that are formed under the influence of heat, pressure or both from pre-existing rocks are called Metamorphic rocks.
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