do you know any thing about volcano?

Question

facts,details and information

Answer 1

What is a volcano?
When pressure from the molten rock beneath the earth's surface becomes too great, the rock, usually accompanied by lava or gases, escapes through a fissure or vent in the crust of the earth. "Volcano" is the term given to both the vent and the conical mountain left by the overflow of the erupted lava, rock and ash.

More than 80% of the earth's surface comes from volcanoes. Innumerable volcanic eruptions formed the sea floor and some mountains; gaseous emissions from volcanoes formed the earth's atmosphere.

The name "volcano" is said to have come from Vulcano, a volcanic island in the Aeolian Islands of Italy. The name Vulcano originates from Vulcan, a god of fire in Roman mythology. The study of volcanoes is called volcanology (sometimes spelled vulcanology).

Seismographic monitoring, tiltmeters and surveillance by satellite all serve to predict activity in a volcano. Gas and steam emissions can also indicate an impending volcanic eruption.

There are more than 500 active volcanoes in the world. More than half of these volcanoes are part of the "Ring of Fire," a region that encircles the Pacific Ocean. The world's largest active volcano is Mauna Loa in Hawaii. Taller than Mount Everest, Mauna Loa's summit rises 56,000 ft (17,000 m) from its base below sea level.

What happens when a volcano erupts?

Lava can flow slowly or erupt violently into the air. The rocks blown out of a volcano – called pyroclastic rocks – fall back to earth as dust, ash, cinder or pumice. Most volcanic ash falls to the ground; cemented together by water it forms a rock called volcanic tuff. Depending on how often they erupt, volcanoes may be classified as active, intermittent, dormant, or extinct. The resulting effects can include:

* Pyroclastic Flows — mixtures of hot gas, ash and other volcanic rocks which travel very quickly down the slope of a volcano. The heat is so great that anyone caught in such a flow will most likely be killed. The speed of the pyroclastic flow is so fast that it cannot be outrun and it is best to evacuate all people living near a volcano that is suspected of producing this kind of flow.
* Nues Ardentes — literally, "incandescent cloud." One of the most destructive kinds of volcanic eruptions, it occurs when viscous magma erupts under reasonably low pressure, causing a glowing cloud of ash and pumice to be thrown into the air. This mass avalanches back to earth before it can cool off. Made up of a mixture of gas, lava, blocks, ash and pumice, nues ardentes can reach speeds up to 310 mi/hr (500 km/hr).
* Volcanic Ashes — volcanic rock which is exploded from a vent in fragments less than an inch (2.5 cm) in size. Volcanic ash particles are like small sharp glass particles that damage anything they come across. During heavy rains of ash, buildings may collapse and people and animals may be suffocated.
* Lahars — mudflows formed by the mixing of volcanic particles and water. The force of a lahar is so great that buildings may be crushed or carried away; those that are left may become partially or completely buried by one or more cement-like layers of rock debris. Since the lahars move so quickly, people caught in their path may drown, be crushed or be asphyxiated. It is best to evacuate people living in the vicinity of a volcano that may produce lahars.
* Debris Avalanches — debris that is transported away from the slope, due to the instability of the volcano's slope. Debris avalanches usually occur on large, steep volcanoes, and are one of the most hazardous but least common of volcanic dangers. The bigger the avalanche, the greater its speed and the more dangerous it is.
* Landslides — a gradual, downslope movement of a mass of bedrock. The mixture of debris from a landslide or avalanche with water may produce harmful lahars.
* Volcanic eruptions can precipitate other natural disasters, such as earthquakes, flash floods, acid rain, fires and tsunamis.

Answer 2

A geological landform on the surface of the Earth (and other planets) where magma from the planet's interior erupts (or once erupted) to the surface. Roughly defined, a volcano consists of a magma chamber, pipes and vents. The magma chamber is where magma from deep within the planet accumulates, while pipes are channels that lead to surface vents, openings in the volcano's surface through which lava is ejected during an eruption. Some volcanoes produce material which builds up into a large mountain-like structure, other types of volcano form different landforms.

Volcanoes are generally found where two or more tectonic plates diverge or converge. The mid-oceanic ridges, like the Mid-Atlantic Ridge, are typical examples of divergent tectonic plates where volcanoes are formed, whereas the Pacific Ring of Fire is a typical example of volcanic activity on convergent tectonic plates. Where two tectonic plates slide past one another (like the San Andreas fault) volcanic activity is generally not found.

Volcanic activity can also occur due to mantle plumes, the so-called hotspots, which occur at locations far from plate boundaries; hotspot volcanoes are also found elsewhere in the solar system, especially on its rocky planets and moons. In July 2006, a new type of volcano was discovered, which was called a petitspot, to accentuate the difference with volcanoes formed by mantle plumes.

Answer 3

A volcano is the point where the heat from the earth's mantel escapes. To learn more look it up at wikipedia.com.

Answer 4

I think that volcanoes are one of the most underrated natural disasters. They're fascinating all around.

Answer 5

OH yes of course ,Volcano spread lava and magma...

Answer 6

what kind of facts there is a lot. Need to limit it a bit or you will be sitting here reading for a while

Answer 7

The Movie? Its cool

Answer 8

just that it is hot and the lava builds up befor erupting. do a google search if you want a full answer

Answer 9

the pressure in the mantle goes up, and the thing explodes

http://volcano.und.edu/vwdocs/vw_exchange.html

Answer 10

yes what do you want to know