Grade Level: 3-5,
6-8,
9-12
Review this page to learn about the background of volcanoes and their eruptions.
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In addition to the changes brought about by natural forces, it has recently become apparent that a relative newcomer to planet Earth — the human being — has become a powerful agent of environmental change.
Grade Level: 3-5,
6-8,
9-12
Background information on ocean circulation.
Grade Level: 6-8,
9-12
Background information on the El Nino Southern Oscillation or ENSO.
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