A volcano is a mountain that opens downward to a reservoir of molten rock below the surface of the earth. Scientists have long known that volcanoes can cool the atmosphere, mainly by means of sulfur dioxide gas that eruptions expel and droplets of sulfuric acid that form when the gas combines with oxygen in the upper atmosphere can remain for many months, reflecting sunlight away from Earth and lowering temperatures. Geological Survey Volcano Hazards Program Listen to Local OfficialsLearn about the emergency plans that have been established in your area by your state and local government. The danger area around a volcano covers approximately a 20-mile radius however some danger may exist 100 miles or more from a volcano. In the Guanacaste Range it is usual that what receives the name of a volcano is actually a massif with several craters or volcanic peaks. This site contains a detailed page on how volcanoes are formed, which says the time line (around millions of years) and how the eruption occurs; (plate boundaries).
The Central Volcanic range has more active volcanoes, and are also younger (less than 1 my) than the volcanoes of the Guanacaste range (less than 2 my). Less gas and more viscous magma usually mean a less dramatic eruption, often causing streams of lava to ooze from the vent.The mountain-like mounds that we associate with volcanoes are what remain after the material spewed during eruptions has collected and hardened around the vent.
About 90 percent of all volcanoes exist within the Ring of Fire along the edges of the Pacific Ocean.About 1,900 volcanoes on Earth are considered active, meaning they show some level of activity and are likely to explode again.

Most of the Costa Rican volcanoes are located in the Guanacaste and Central Volcanic range. The Arenal Volcano was almost a perfect cone, until 1968, when after almost 500 years of inactivity the volcano exploded and more craters developed.
A geothermic project run by the Instituto Costarricense de Electricidad (Costa Rican Electricity Institute) takes place in the Miravalles volcano.
During a Volcanic EruptionFollow the evacuation order issued by authorities and evacuate immediately from the volcano area to avoid flying debris, hot gases, lateral blast and lava flow.Be aware of mudflows.
A volcanic eruption is the point in which a volcano is active and releases lava and poisonous gasses in to the air.
Volcanic ash can affect people hundreds of miles away from the cone of a volcano.Sideways directed volcanic explosions, known as "lateral blasts," can shoot large pieces of rock at very high speeds for several miles. Volcano Info also contains information on active volcanoes, giving details on where they are, and how countries are preparing for when they erupt.
This can happen over a period of weeks or many millions of years.A large eruption can be extremely dangerous for people living near a volcano. Many other volcanoes are dormant, showing no current signs of exploding but likely to become active at some point in the future.

Most of these volcanoes and the surrounding areas are protected as National Parks, they are very close to San Jose city and visit one of them is a perfect one-day trip.
Common causes include lightning, human carelessness, arson, volcano eruption, and pyroclastic cloud from active volcano.
One of the word's most active volcanoes, Mount Merapi is the bringer of life and death for a wide swath of the island of Java. Website with volcano activity updates, feature stories, information about volcano hazards and resources.
As lava from the Kilauea volcano crept closer to his Hawaiian home, resident Gary Sleik felt three years of anxiety go up in smoke. From snow-capped peak to smoldering crater, see how the major eruption 30 years ago today changed the face of the famous volcano.
The site also has effects after a volcano erupts, including how rescue missions occur and how the government helps etc.

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