Difference between Volcanic Rocks and Plutonic Rocks
Volcanic rocks and plutonic rocks both are igneous rocks. Although both are igneous rocks, they are different from each other in terms of their colour, formation and size of granules. Let us how they differ from each other!
Volcanic rocks are formed above the ground from the hot magma that erupts from a volcano onto the surface of the Earth. The hot magma is called lava when it comes out onto the Earth's surface. As the lava cools down it starts changing into crystals. The crystals continue to grow as long as lava keeps losing heat and cools or solidifies.
Volcanic rocks are formed quickly as the lava cools quickly so their crystals tend to be very small and thus they are fine-grained. These rocks can be made of ash, which is a pulverized rock blown into the air. The volcanic rocks are named after volcanoes as they are formed of lava that erupts from the volcanoes. The volcano is named after Vulcan which is a Roman God of fire and metalworking. Some common examples of volcanic rocks are basalt, rhyolite etc.
Plutonic rocks are igneous rocks that are formed underground or deep under the Earth's surface. They are intrusive igneous rocks with coarse grain size and are formed due to the intrusion or insertion of magma between other rocks below the surface of the Earth. This magma cools down or solidifies below the surface to form plutonic rocks. Plutonic rocks are coarse-grained as they are formed slowly that allows the formation of large crystals before the magma solidifies into a rock.
Plutonic rocks are one of the most commonly found rocks on the Earth. They serve as a foundation for our continents and mountain ranges. They can be divided into acidic, basic and ultra-basic types on the basis of their mineral and chemical composition. Some common examples of plutonic rocks are granite, diorite, aplite, pegmatite, syenite etc
Based on the above information, some of the key differences between volcanic and plutonic rocks are as follows: