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.
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. 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 National Geographic Society aims to be an international leader for global conservation and environmental sustainability. 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. 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. These formations are essentially vents on the Earth's surface where molten rock, debris, and gases from the planet's interior are emitted.When thick magma and large amounts of gas build up under the surface, eruptions can be explosive, expelling lava, rocks and ash into the air. 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. 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.

A geothermic project run by the Instituto Costarricense de Electricidad (Costa Rican Electricity Institute) takes place in the Miravalles volcano.
Ash and toxic gases can cause lung damage and other problems, particularly for infants and the elderly. 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. Many other volcanoes are dormant, showing no current signs of exploding but likely to become active at some point in the future.

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