A volcano begins as melted rock (magma) which rises from deep inside the earth
toward the surface. As the gas-filled magma rises ...
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 ...
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
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.
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 ...
www.ask.com/youtube?q=What Makes A Volcano Erupt&v=-kQwudeT3ww
Jun 29, 2013 ... A quick and fun cartoon lesson about volcanoes. Great for teachers and students-
hope you guys enjoy! Be sure to subscribe if you like it, there ...
There are few geological events that are as dramatic as a volcanic eruption
except maybe a hurricane, tornado or a tsunami. Each is drama.
Nov 30, 2010 ... It's time for our weekly Just Ask feature, where the experts tackle your questions
on science and technology. John Eichelberger, a volcano ...
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
May 26, 2016 ... Volcanic eruptions are driven by a combination of mechanisms, ... What is it
exactly that makes molten rock rise from the Earth's interior and ...