Polar Bear, Why Is Your World Melting', Paperback/Robert E. Wells

Polar Bear, Why Is Your World Melting', Paperback/Robert E. Wells

Autor

Robert E. Wells

Editura

Albert Whitman & Company

An publicare

2008

Nr. Pagini

32

ISBN

9780807565995

Categorii

In Limbi Străine Children's Teenage & Educational Teenage: General Interest

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Descriere

In the Arctic, the summer ice is melting, making it hard for polar bears to survive. Why is the world getting warmer? The heat of the sun is trapped by the -greenhouse- gases that surround Earth--carbon dioxide, methane, nitrous oxide, and water vapor.

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