1
Short interactive explaining the greenhouse effect and global warming
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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2
Under the surface , Although the surface of a wind wave appears to move forward in the general direction of the wind, the water inside a wind wave doesn't move forward very much.The waves at the surface of the ocean are called wind waves. Waves are set in motion by winds. Change the progressive...
Grade Level   4 5 6 7 8 9 10 11 12
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