Several factors trigger volcanic eruptions, including the buoyancy of magma, a build-up of pressure from the gases in the magma and an injection of new magma into a full magma chamber.
When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged.
Volcanoes erupt because of density and pressure. The lower density of the
magma relative to the surrounding rocks causes it to rise (like air bubbles in
Find out what the earth make-up is, and how extreme pressure build up inside
the earth forces molten matter to be expelled out to the surface, causing a
Some volcanic eruptions are explosive and other are not. How explosive an
eruption is depends on how runny or sticky the magma is. If magma is thin and ...
Aug 4, 2015 ... Piton de la Fournaise or “Peak of the Furnace” on Reunion Island is one of the
world's most active volcanoes, shown erupting in August 2015.
May 26, 2016 ... Volcanoes come in many shapes and sizes, ranging from common cinder cone
volcanoes that build up from repeated eruptions and lava ...
Hot melted rocks collect under the Earth's surface and when the pressure
becomes too hard, the Earth's skin breaks, and a volcano erupts. The melted rock
Feb 3, 2017 ... Researchers have captured dramatic footage of a stream of lava pouring into the
Pacific from the Kilauea volcano in Hawaii. The intensity of the ...
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Jan 5, 2015 ... The eruption of a volcano can be one of the planet's most destructive events —
spewing huge amounts of rock, gas and ash that can kill people.