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crust of a planetary-m**** object, such as Earth, that
allows hot lava,
volcanic ash, and
gases to
escape from a
magma chamber below the surface. On Earth...
- of
volcanic eruptions—during
which lava,
tephra (ash, lapilli,
volcanic bombs and
volcanic blocks), and ****orted
gases are
expelled from a
volcanic vent...
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Volcanic rock (often
shortened to
volcanics in
scientific contexts) is a rock
formed from lava
erupted from a volcano. In
other words, it
differs from...
- A
volcanic arc is a
chain of
volcanoes formed above a
subducting plate,
positioned in an arc
shape as seen from above. Offs****
volcanoes form islands...
- The
Volcanic Explosivity Index (VEI) is a
relative measure of the
explosiveness of
volcanic eruptions. It was
devised by
Chris Newhall of the
United States...
-
Volcanic ash
consists of
fragments of rock, minerals, and
volcanic gl****,
created during volcanic eruptions and
measuring less than 2 mm (0.079 inches)...
- A
volcanic winter is a
reduction in
global temperatures caused by
volcanic ash and
droplets of
sulfuric acid and
water obscuring the Sun and
raising Earth's...
- A
volcanic crater is an
approximately circular depression in the
ground caused by
volcanic activity. It is
typically a bowl-shaped
feature within which...
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second largest volcanic island, and Jan Mayen. Both are in the Atlantic. A
third type of
volcanic oceanic island is
formed over
volcanic hotspots. A hotspot...
-
Volcanic gl**** is the
amorphous (uncrystallized)
product of
rapidly cooling magma. Like all
types of gl****, it is a
state of
matter intermediate between...