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Volcanoes are small mountains formed by magma rising up between the plates and solidifying into rock. There are many types of volcano. these include fissure, shield dome, cinder, composite and caldera volcanoes
Igneous rocks are rocks that have been formed by lave solidifying on the earths surface. Some of its characteristics are, being course grained, have many small holes in it, no fossils and are non-porous
Difference between plutonic and volcanic igneous rocks
Plutonic rocks are formed below the earth’s surface
Volcanic rocks are formed when they are shot out of a volcano and cooled on the earths surface
Small jagged pieces of rocks, minerals, and volcanic glass the size of sand and silt erupted by a volcano are called volcanic ash. Volcanic ash is not the product of combustion, like the soft fluffy material created by burning wood, leaves, or paper. Volcanic ash is hard, does not dissolve in water, is extremely abrasive and mildly corrosive, and conducts electricity when wet.
Volcanic eruptions can be extremely damaging to the environment, particularly because of a number of toxic gases possibly present in pyroclastic material. it contains carbon dioxide and sulphur dioxide gas. These can cause both humans and plants to suffocate.