how volcanoes form and erupt?

how volcanoes form and erupt?
Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth's mantle melts. ... As the magma rises, bubbles of gas form inside it. Runny magma erupts through openings or vents in the earth's crust before flowing onto its surface as lava.
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How are volcanoes formed?
On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.
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What are 3 ways volcanoes form?
Volcano World
There are three main places where volcanoes originate: Hot spots, Divergent plate boundaries (such as rifts and mid-ocean ridges), and. Convergent plate boundaries (subduction zones)
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What are the 4 ways a volcano can erupt?
Hydrothermal eruption. An eruption driven by the heat in a hydrothermal systems. ...
Phreatic eruption. An eruption driven by the heat from magma interacting with water. ...
Phreatomagmatic eruption. ...
Lava. ...
Strombolian and Hawaiian eruptions. ...
Vulcanian eruptions. ...
Subplinian and Plinian eruptions.
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