When a volcano erupts, hot magma (molten rock), gases and volcanic ash are emitted. The explosiveness of the eruption depends on the consistency of the magma and the amount of pressure built up prior to eruption.
Volcanoes erupt to release pressure built up in the magma chamber by expelling
the magma as lava. Along with lava, a volcanic eruption releases ash and ...
A volcanic eruption sometimes triggers other natural disasters, including floods,
landslides, earthquakes and forest fires. The ash in the air affects both humans ...
An eruption begins when pressure on a magma chamber forces magma up
through the conduit ... Volcanic activity is classified by how often a volcano erupts
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.
Volcanic eruptions happen deep down inside the earth. When the earth's tectonic
plate's shift, it causes more than just earthquakes, it can create new volcanoes ...
Volcanoes erupt in different ways. Some are quite quiet. Others are very forceful
and send tons of stream, ash and rocks into the air.
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
Feb 7, 2012 ... A caldera is a very large crater that forms after a very large volcanic eruption. The
eruption is explosive and ejects a lot of material. Most of what ...
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 ...