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Volcanoes erupt due to pressure that the weight of the rocks puts on the magma and forces it to the surface out any available vent or exit provided to it. The magma is in a reservo...

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.



Erupting volcanoes can pose many hazards, not only in the immediate ... from the core-mantle boundary in a fixed space that causes large-volume melting.

What causes a volcano erupt?


A volcano begins as melted rock (magma) which rises from deep inside the earth toward the surface. As the gas-filled magma rises ...

Why are there volcanoes? Why do they erupt? | Volcano World ...


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 syrup).

What causes a volcano to erupt and how do scientists predict ...


Nov 29, 1999 ... 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 ...

Why Do Volcanoes Erupt? | Science Articles | PlanetSEED


What disturbs the peaceful slumber of a volcano and makes it erupt? Find out the answer and see images of erupting volcanoes on PlanetSEED today.

Volcanoes - Weather Wiz Kids weather information for kids


An erupting volcano can trigger tsunamis, flash floods, earthquakes, ... The friction causes earthquakes and volcanic eruptions near the edges of the plates.

Why do volcanoes erupt? | Earth | EarthSky


Aug 20, 2015 ... ... from Earth's crust to the surface. Here's why eruptions happen. ... It is increased magma movement within a volcano that causes an eruption.

Why Volcanoes Erupt - YouTube


Jun 29, 2013 ... A quick and fun cartoon lesson about volcanoes. ... Why Volcanoes Erupt ..... HOW TO MAKE A VOLCANO Easy Kids Science Experiments ...

Popular Q&A
Q: What makes volcanoes erupt?
A: Explosive eruptions occur when thick magma and large amounts of gas build up under the surface. Ask us. report this answer. Updated on Wednesday, February 01 20... Read More »
Source: www.kgbanswers.com
Q: What makes a volcano erupt?
A: a volcano erupts when the pressure in the ground comes to life l. Read More »
Source: wiki.answers.com
Q: What makes a volcano erupt?
A: Magma (hot molten rock) is less dense (lighter) than the solid rock and tends to want to move upward. When it reaches the surface, it erupts. Other factors such... Read More »
Source: answers.yahoo.com
Q: What makes the volcano erupt?
A: When you mix vinegar and baking soda together, it creates carbon dioxide. Carbon dioxide is the same gas that causes the lava to bubble and is produced during a... Read More »
Source: kevinandmarnieparker.blogspot.com
Q: What makes a volcano erupt?
A: Materials/Equipment Needed: Paper, Pencil, ComputerANTICIPATORY SET: I will begin the lesson by saying, “You’ve heard about volcanoes erupting in Hawaii and hav... Read More »
Source: theapple.monster.com