Why do volcanoes erupt?

Answer

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 inside the Earth is called magma, but when it comes out in an eruption, it is called lava.

Plates are like the Earth's skin. They are called the Earth's mantle, and they float on the magma. Sometimes the plates separate, and that creates even more red-hot liquid rock. The Earth has to relieve the pressure in the form of a volcanic eruption. After the eruption, the lava spreads out, cools down and hardens into rock, but hot magma remains under the surface.

In the Pacific Ocean, 75 percent of all volcanoes are located in an area called the Ring of Fire, where two of the Earth's plates meet. Some volcanoes are cone-shaped mountains, some are flat-topped like mountain plateaus, some have fissure vents, which are cracks where the lava escapes, and others bulge like domes. There are even volcanoes on the ocean floor and under the icecaps in Iceland.

Volcanoes also happen on other planets in the solar system. On Mars there is a volcano called Olympus Mons, and it is 373 miles wide and 13 miles high. The most volcanic activity in the solar system is on one of Jupiter's moons.

Q&A Related to "Why do volcanoes erupt?"
Volcano's erupt because the volcano's is the heat deep within the Earth's mantle. The heat slowly melts the rocks to create a slow moving substance called magma. After a while the
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The reason volcanoes erupt is because the temperature is so hot within the Earth that some of the rock will melt. This will happen when the temperature of the Earth rises, and the
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When rock inside the Earth becomes hot enough, it melts. This molten rock, or magma, is less dense than the surrounding solid rock. Just as an object that is less dense than water
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Volcanoes erupt as a result of building pressure underground because of shifting plates that
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1 Additional Answer
Ask.com Answer for: why do volcanoes erupt
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.
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