What is Volcano? | ||
| A volcano is a vent or 'chimney' that connects molten rock (magma) to the Earth's surface. It includes the surrounding cone of built-up material. Magma erupting from a volcano is called lava. Gases and pieces of rock erupt from volcanoes too. A volcano is active if it erupts lava, releases gas or shows seismic activity. It is dormant if it hasn't erupted for a long time but could again one day. An extinct volcano will never erupt again. The explosiveness of a volcanic eruption depends on how easily magma can flow and the amount of gas trapped in it. Large amounts of water and carbon dioxide are dissolved in magma. They behave like gas in fizzy drinks. After opening the bottle the gas expands, forming bubbles that escape. This also happens when magma rises quickly through the crust - gas bubbles form and expand up to 1000 times their original size. Source : http://library.thinkquest.org | ||
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| How Volcanoes Work This website is a comprehensive educational resource that describes the science behind volcanoes and volcanic processes. | ||
| Volcano World Brings modern and near real-time volcano information to school kids. | ||
| Volcano - Wikipedia, the free encyclopedia A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. ... | ||
| Types of Volcanoes Types of Volcanoes. Volcanologists have classified volcanoes into groups based on the shape of the volcano, the materials they are built of, and the way the ... | ||
| Volcanoes: Principal Types of Volcanoes Principal Types of Volcanoes. Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield volcanoes, and lava domes ... | ||
| How Volcanoes Work - types of volcanic eruptions The various eruption types are typically associated with particular volcano types. Shield volcanoes, for example, generate low-viscosity basalts associated | ||
| Volcanoes of the World - John Seach Volcanoes of the World - John Seach Over 2000 volcanoes. Volcanoes arranged by country and region. Every volcano which has erupted in the past 10000 years | ||
| NOVA Online | Deadly Shadow of Vesuvius | The World's Deadliest ... The World's Deadliest Volcanoes How do you measure the size of a volcanic eruption? Just as seismologists measure the size of an earthquake using the ... | ||
| Why do volcanoes erupt? What is a volcano? A volcano is a vent or 'chimney' that connects molten rock ( magma) to the Earth's surface. It includes the surrounding cone of built-up ... | ||