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This paper will define and discuss the volcano to include types of volcanoes formation of a volcano and elements of a volcano such as lava rock fragments and gas This paper also tells a little bit about volcanic activity in different parts of the world What is a volcano A volcano is a vent in the earth from which molten rock and gas erupt The molten rock that erupts from the volcano forms a hill or mountain around the vent The lava may flow out as a viscous liquid or it may explode from the vent as solid or liquid particles Kinds of Volcanic Materials Three basic materials that may erupt from a volcano are 1 lava 2 rock fragments and 3 gas Lava Lava is the name for magma that has been released onto the Earths surface When lava comes to the Earths surface it is red hot and may have temperatures of more than 2012 degrees Fahrenheit Fluid lava flows swiftly down a volcanos slopes 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 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 boulders and rubble called block flows It may also form
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