-
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...
- A
volcanic eruption occurs when
material is
expelled from a
volcanic vent or fissure.
Several types of
volcanic eruptions have been
distinguished by volcanologists...
- The
volcanic explosivity index (VEI) is a
scale used to
measure the size of
explosive volcanic eruptions. It was
devised by
Christopher G.
Newhall of the...
-
Volcanic ash
consists of
fragments of rock,
mineral crystals, and
volcanic gl****,
produced during volcanic eruptions and
measuring less than 2 mm (0.079 inches)...
-
Volcanic rocks (often
shortened to
volcanics in
scientific contexts) are
rocks formed from lava
erupted from a volcano. Like all rock types, the concept...
- The
volcanic winter of 536 was
among the most
severe and
protracted episodes of
climatic cooling in the
Northern Hemisphere in the last 2,000 years. The...
- Tuff is a type of rock made of
volcanic ash
ejected from a vent
during a
volcanic eruption.
Following ejection and deposition, the ash is
lithified into...
-
Volcanic cones are
among the
simplest volcanic landforms. They are
built by
ejecta from a
volcanic vent,
piling up
around the vent in the
shape of a cone...
- The
Auckland volcanic field is an area of
monogenetic volcanoes covered by much of the
metropolitan area of Auckland, New Zealand's
largest city, located...
- The
Volcanic Repeating Arms
Company was an
American company formed in 1855 by
partners Horace Smith and
Daniel B.
Wesson to
develop Walter Hunt's Rocket...
