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Nova's video Earth from Space - 2 hours
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This is a must-see video for grades 3-12. It shows images of Earth from Space through 7 different spectrums of light, each one revealing astonishing truths about the condition of the Earth. This is a perfect lead-in to Ecology lessons because it shows the "big picture". It helps students to draw some important conclusions that will inspire interest, concern and hopefully, activism for the environment.
Click http://player.pbs.org/viralplayer/2334144059/ link to open resource.