1
The greenhouse effect is the name scientists use to describe how heat accumulates in Earth's atmosphere. A majority of the energy from the Sun arrives at Earth as visible radiation. This energy passes through our atmosphere and warms Earth's surface. The warmed surface re-emits invisible infrared...
Grade Level   6 7 8
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2
Heat islands result when people alter their surroundings, substituting man-made asphalt roads, tar roofs, and other features for vegetation. Trees and other plants provide shade and cool the air through evapotranspiration. Hard, dark surfaces like pavement store heat during the day. That heat is...
Grade Level   6 7 8
Classroom Activities Curricula and Instruction
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3
In many rural parts of the world, people still cook with wood. They often must collect and carry the wood many miles on their backs. They also cut down trees and shrubs instead of letting them grow tall for shade. In these areas, especially if the climate is dry, there is lots of sunshine; a solar...
Grade Level   3 4
Classroom Activities Curricula and Instruction
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4
Windmills have been used for hundreds of years to collect energy from the wind. They have been used to pump water, to grind grain, and -, more recently -, to generate electricity. In some modern wind generators, the blades are very thin. But there are many possible designs, and engineers are always...
Grade Level   3 4
Classroom Activities Curricula and Instruction
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