A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that
allows hot lava ... Erupting volcanoes can pose many hazards, not only in the
immediate vicinity of the eruption. ...
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 ...
A volcano begins as melted rock (magma) which rises from deep inside the earth
toward the surface. As the gas-filled magma rises ...
Volcanoes form when magma reaches the Earth's surface, causing eruptions of
lava and ash. They occur at destructive (compressional) and constructive ...
Jun 30, 2016 ... A volcano is a geological feature of the earth where an opening allows magma to
escape from the mantle of the planet.
www.ask.com/youtube?q=What Causes A Volcano Eruption&v=ShOFQ2h2fws
Jun 19, 2014 ... Volcanoes form when magma from the earth's interior is able to make its way to
the surface, via a vent. This is usually associated with plate ...
Where plates move away from each other at spreading or divergent plate
margins, volcanic eruptions are gentle extrusions of basaltic lava. Most of these
Aug 5, 2016 ... ... an enormous volcanic eruption. But, have you ever wondered what causes a
volcano to erupt? If you have, this article has the answer for you.
May 26, 2016 ... Volcanic eruptions are driven by a combination of mechanisms, which include
pressure and heat in the Earth's mantle, as well as tectonic ...
Eruptions can cause lateral blasts, lava flows, hot ash flows, mudslides,
avalanches, falling ash and floods. Volcano eruptions have been known to knock