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Shield volcano
A shield volcano is a wide
volcano with
shallowly-sloping sides.
Shield volcanoes are formed
by lava flows of low
viscosity - lava that flows
easily. Consequently, a
volcanic mountain having a
... > full story
Volcanic cone
Volcanic cones are among the
simplest volcano formations.
They are built by fragments
(called ejecta) thrown up
(ejected) from a volcanic
vent, piling up around the
vent in the shape of a cone
with a central crater.
... > full story
Pyroclastic flow
Pyroclastic flows are a
common and devastating
result of some volcanic
eruptions. They are
fast-moving fluidized bodies
of hot gas, ash and rock
(collectively known as
tephra) which can travel
... > full story
Stratovolcano
A stratovolcano is a tall,
conical volcano composed of
one layer of hardened lava,
tephra, and volcanic ash.
These volcanoes are
characterized by a steep
profile and periodic,
explosive eruptions. The
... > full story
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Yellowstone Caldera
The Yellowstone Caldera, sometimes known as the Yellowstone supervolcano, is a volcanically active region in Yellowstone National Park. It measures 55 kilometers (34 mi) by 72 kilometers (44 mi). ... > more -
Decade Volcanoes
The Decade Volcanoes are 16 volcanoes identified by the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) as being worthy of particular study in light of their ... > more -
Volcanic ash
Volcanic ash consists of very fine rock and mineral particles less than 2 mm in diameter that are ejected from a volcanic vent. Ash is created when solid rock shatters and magma separates into minute ... > more -
Supervolcano
A supervolcano refers to a volcano that produces the largest and most voluminous kinds of eruption on Earth. The actual explosivity of these eruptions varies, but the sheer volume of extruded magma ... > more -
Climate changes of 535-536
In the years 535 and 536, several remarkable aberrations in world climate took place. The Byzantine historian Procopius recorded of 536, "during this year a most dread portent took place. For the sun ... > more -
Volcanic rock
Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts ... > more -
Mount Etna
Mount Etna is an active volcano on the east coast of Sicily, close to Messina and Catania. It is the largest active volcano in Europe, currently standing about 3,350 m (10,991 ft) high, though it ... > more -
Great Chilean Earthquake
The Great Chilean Earthquake or Valdivia Earthquake (Terremoto de Valdivia in Spanish) of May 22, 1960 is the largest magnitude earthquake recorded since seismographic monitoring ... > more
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