A rising plume of liquid rock (also known as magma) can reach the surface from the underlying mantle. There are also volcanoes which explode due to the pressure of water vapor, when porous rocks contain water, and these rocks are heated by magma. Those are called boiler volcanoes.
mostly earthquakes or plate tectonic movement.
Volcanoes are essentially holes in the earths surface through which magma and lava can erupt. when pressure builds up below the earths crust, magma is then forced violently out of the volcanoes.
They are mostly hidden underwater because nothing has yet made them erupt and come to the surface.
Lava. Note: Magma cant erupt, volcanoes do. Magma is just the word for molten rock beneath the earths surface, lava is for molten rock above the earths surface.
When Volcanoes erupt the surface is melted by the lava
yes sometimes
magma
hgbn
Volcanoes occur near plate boudaries because volcanoes need water to erupt.
Well, when earths plates move away from each other that's when it happens but move well then NO!
Did you know that composite volcanoes make up 60% of the Earths volcanoes. Composite volcanoes don't always have to erupt from the top. They can have many magma chambers and can erupt from the sides. They can be made of basalt, rhyolite and/or andesite. They erupt both ash and lava. The lava is very thick. When the time comes for the volcano to erupt they start to become very quiet. (Sneaky eh?)
Via rising molten magma or by mining.