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Bronze Age

Overview page. Subjects: World History — Environmental Science.

The prehistoric period during which bronze was the principal material used for tools and weapons. The transition from the Copper Age is difficult to fix, as is that to the Iron Age which...

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Colorado River

Overview page. Subjects: World History — Environmental Science.

Perhaps no major river system in the world was naturally more resistant to exploration than the Colorado and its tributaries. From the time of the arrival of Europeans in the ...

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Great Basin

Overview page. Subjects: World History — Environmental Science.

A North American cold desert produced by the rain shadow of the Sierra Nevada and Cascade Mountains, which has long, cold winters and much of its precipitation falls as snow.

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Group of Eight

Overview page. Subjects: Environmental Science — World History.

The Group of Seven plus Russia. Russia was admitted as a full member of this economic summit grouping in June 2002.

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Stone Age

Overview page. Subjects: Environmental Science — World History.

Those periods of the past when metals were unknown and stone was used as the main material for missiles, as hammers, for making tools for such tasks as cutting and scraping and, later, as...

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