Which rock type is formed by applying heat and pressure to other rock types and difference between intrusive and extrusive rocks?
Metamorphic rocks form from igneous, sedimentary, or other metamorphic rocks. Heat, pressure, and hot fluids trigger the changes. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet. Sedimentary rocks are formed when sediments are deposited and then compacted and cemented together. Recrystalization is a characteristic of metamorphic rock.
The rock type formed by applying heat and pressure to other rock types is called metamorphic rock. Metamorphic rocks are created when existing rocks, whether sedimentary, igneous, or metamorphic themselves, undergo changes due to intense heat and pressure within the Earth's crust.
Now, let's discuss the difference between intrusive and extrusive rocks:
The intrusive rocks cool slowly beneath the Earth's surface, forming coarse-grained textures, while extrusive rocks cool rapidly on the Earth's surface, resulting in fine-grained or glassy textures.
Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet. Intrusive rocks are formed from magma whereas extrusive rocks are formed from lava. Intrusive rocks are formed deep inside the surface of the earth whereas extrusive rocks are formed at the surface of the earth when magma finds a way to eject or pour out of the surface. Intrusive rocks form when magma cools below the surface. This cooling process is slow, so the chemicals in the magma crystallize slowly, generally creating large and well-formed crystals as the rock solidifies. By contrast, extrusive rocks form when lava cools at or above the surface. Extrusive rocks are formed by the molten lava which comes out of volcanoes, reaches the earth's surface and cools down rapidly to become a solid piece of rock. When the molten magma cools down deep inside the earth's crust, the solid rocks so formed are intrusive rocks. An intrusion is anybody of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock, formed above the surface of the crust. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet. Metamorphic rocks result when existing rocks are changed by heat, pressure, or reactive fluids, such as hot, mineral-laden water.
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