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Volcanos - Volcano This paper will define and discuss the...

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Volcano V This paper will define and discuss the volcano to include: types of volcanoes, v formation of a volcano, and elements of a volcano; such as, lava, rock fragments, and gas. a This paper also tells a little bit about volcanic activity in different parts of the world. t What is a volcano? W A volcano is a vent in the earth from which molten rock and gas erupt. The molten m rock that erupts from the volcano forms a hill or mountain around the vent. The lava may l flow out as a viscous liquid or it may explode from the vent as solid or liquid particles. p Kinds of Volcanic Materials K Three basic materials that may erupt from a volcano are; 1. lava, 2. rock T fragments, and 3. gas. Lava L Lava is the name for magma that has been released onto the Earth's surface. When W lava comes to the Earth's surface, it is red hot and may have temperatures of more than t 2012 degrees Fahrenheit. Fluid lava flows swiftly down a volcano's slopes. 2 Sticky lava flows more slowly. As the lava cools, it may harden into many different formations. Highly fluid lava hardens into smooth, folded sheets of rock called pahoehoe. p Stickier lava cools into rough, jagged sheets of rock called aa. Pahoehoe and aa cover large areas of Hawaii, where the terms originated. The stickiest lava forms flows of o
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boulders and rubble called block flows. It may also form mounds of lava called domes. d Other lava formations are spatter cones and lava tubes. Spatter cones are steep hills s that can get up to 100 feet high. They build up from the spatter of geyser-like eruptions of e thick lava. Lava tubes are tunnels formed from fluid lava. As the lava flows, its exterior e covering cools and hardens. But the lava below continues to flow. After the flowing lava l drains away, it leaves a tunnel. d Rock Fragments R Rock fragment are usually called tephra and are formed from sticky magma.
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