
Overview
Volcanoes are mountains made from molten rock. The Earth’s crust is divided into big slabs, called plates, which are slowly moving all the time. The plates are floating on the Earth’s mantle, a layer of gooey hot rock that flows like maple syrup. Some places in the mantle, the rock gets very hot and nearly liquid. It’s called magma. Sometimes the magma reaches the Earth’s surface and forms a volcano.
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4 - 1Rivers & Streams November 03, 1995
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4 - 2Nutrition November 10, 1995
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4 - 3Marine Mammals November 17, 1995
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4 - 4Earthquakes November 24, 1995
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4 - 5NTV Top 11 Video Countdown December 01, 1995
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4 - 6Spiders January 05, 1996
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4 - 7Pollution Solutions January 12, 1996
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4 - 8Probability January 19, 1996
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4 - 9Pseudoscience January 26, 1996
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4 - 10Flowers January 27, 1996
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4 - 11Archaeology January 28, 1996
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4 - 12Deserts January 29, 1996
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4 - 13Amphibians January 30, 1996
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4 - 14Volcanoes January 31, 1996
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4 - 15Invertebrates February 07, 1996
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4 - 16Heart February 14, 1996
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4 - 17Inventions February 21, 1996
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4 - 18Computers April 25, 1996
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4 - 19Fossils September 05, 1997
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4 - 20Time September 12, 1997