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A volcano is a vent in the earth's crust through which magma, rock fragments, gases, and ash are ejected from the earth's interior. Over time, accumulation of these erupted products on the earth's surface creates a volcanic mountain.
Funk & Wagnalls New World Encyclopedia
Don't know anything about a topic? Start here and find some general articles to get you started. This is suitable for upper elementary and older, as it does not include pictures.
Science Reference Center
Topics covered include biology, chemistry, earth & space science, environmental science, health & medicine, history of science, life science, physics, science & society, science as inquiry, scientists, technology and wildlife. Content is correlated to state and national curriculum standards.