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Grasslands (English)

Grasses are the most common plants in grasslands, but there are many types, and grasslands are not...Added June 22, 2010
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States of Matter: Gases, Liquids, and Solids (English)

Without the different states of matter - the solids, liquids, and gases that make up our universe...Added June 22, 2010
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Earthquakes and Volcanoes (English)

Though the Earth's outermost shell is comprised of tectonic plates that are constantly shifting...Added June 22, 2010
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Rivers, Lakes, and Oceans (English)

Water covers more than 70 percent of Earth's surface, and all of it is connected in the...Added June 22, 2010
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Caves (English)

Here is a captivating new introduction to the world's most fascinating caves. ""Caves"" explores...Added June 22, 2010
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Tropical Forests (English)

Tropical forests are the most diverse and complex of the world's ecosystems. They are also among...Added June 22, 2010
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Water and Atmosphere: The Lifeblood of Natural Systems (English)

Without the crucial resources of water and atmosphere, life would not be possible on Earth....Added June 22, 2010
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Canyons (English)

Canyons chronicles the origins, history, and structure of the world's most breathtaking gorges,...Added June 22, 2010
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Floods: Hazards of Surface and Groundwater Systems (English)

There are many different types of floods, ranging from slowly rising regional floods to dramatic...Added June 22, 2010
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Wetlands (English)

Wetlands are among the wildest places on Earth. Used throughout the years as a valuable means of...Added June 22, 2010