Journey to Etna: Lava Flow and Gas Emissions
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Molten rock below ground is called magma, but when it erupts above ground it's known as lava. When the lava flows cool and solidify they form igneous rock. Depending on the mineral composition of the lava, it will cool and form two distinctive structures, known as aa and pehoehoe. Volcanoes also emit huge amounts of gases when they erupt, such as carbon dioxide and sulphur dioxide, and they even emit gold. Major eruptions can significantly alter the earth's atmosphere for years.
Video Series: How Science Works
Release Date 2009
Video Series: How Science Works
Release Date 2009
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