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 .... Like ...
Volcanoes can remain inactive, or dormant, for hundreds or thousands of years
before erupting again. During this time they can become covered by vegetation ...
Most volcanoes occur in the basin of the Pacific Ocean, also known as the Ring
of Fire. Most volcanoes are ... Why do earthquakes and volcanoes happen mostly
in the same place? ... How many people died when Krakatoa erupted? Q: ...
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 ...
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 ...
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
Volcanic activity occurs at two types of plate boundaries: mid-ocean ridges and
subduction zones. At mid-ocean ridges, basaltic eruptions produce new sea-floor
Apr 10, 2015 ... Here are the countries most at risk of a deadly volcanic eruption, according ...
though the volcano did not erupt, according to historical accounts.
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 ...
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