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Assignment Discovery: Savanna Biomes

The savannah biome is described as an area with low precipitation and hot weather. Savannahs are found in central and southern Africa, South America, Australia and Inda. Learn more about the savannah on Discovery Channel's "Assignment Discovery."


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Essential and Endangered: Fishing (1:09)

Fishing along the Hudson River was banned when it was discovered that polychlorinated biphenyls that contaminate the water were also in the fish.

A Natural Focus: Basalt (0:43)

Thin soil, strong winds, hot sun, and a bedrock of basalt rock determine what grows in this forest range.

A Natural Focus: Sandstone (0:44)

Sheltered from the harsh wind, and nurtured by water seeping through the sandstone, a thick layer of herbs flourishes.

A Natural Focus: Floodplain (0:47)

The richest, deepest soils of the Holyoke Range are found by the riverside. To thrive here, plants must be able to withstand frequent flooding.

A Natural Focus: The Mouth of the River (0:38)

The Westfield River drops over 2,000 feet in less than 30 miles to join the Connecticut River, and forms less than four percent of the Connecticut Riverís watershed.

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Groundbreaking research by Alfred Wegener reveals that all the continents were once connected as one single land mass he called Pangaea. Learn more about Wegener's continental drift theory on The Science's Channel's "100 Greatest Discoveries."

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Take a look at this quiz to test your knowledge of life in the desert.

Life in the Desert System: Deserts of North America (2:46)

North America has four major desert system. The Mojave Desert is located between the Sonoran Desert and the Great Basin Desert. The Chihuahuan Desert spans across the border of the U.S. and Mexico.

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Check out this video to learn the characteristics of an ecosystem and predator-prey interactions.