Despite chemistry courses being one of the most difficult classes in high school, over 100,000 students took the AP* Chemistry exam in 2009. This...
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Many mysterious questions about the Ice Age arise: What would cause the summer temperatures of the northern United States and Europe to plummet o...
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Wieland‰۪s riveting text and easy descriptions are complemented by the beautiful full-color illustrations by acclaimed artist Darrell Wiskur. Rea...
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These all-inclusive skills resources provide the focused practice students need to apply, reinforce, and review skills in math and test-taking. An...
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