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 National Science Foundation: Predicting Seasonal Weather How does a meteorologist or other such individual predict seasonal weather? That question forms the basis for this special report from the National Science Foundation. The interactive report starts by offering an explanation of how the U.S. economy is affected by weather conditions, and it reviews a bit of material on how different businesses attempt to mitigate the effect of varying weather... http://www.nsf.gov/news/special_reports/autumnwinter/
 Relative Humidity in the Winter and Summer This applet simulates what happens inside a house when the temperature and dew point change outside. The user of this applet has control over the outdoor values of the two thermometers (one for temperature and one for dew point). The relative humidity meter will instantly display the value for the outside. The user will learn that as the outdoor values are changed, the indoor environment is... http://profhorn.aos.wisc.edu/wxwise/relhum/rhac.html
 National Geographic Education: The Reason for the Seasons How does the sun determine the Earth's seasons? This is the question that the National Geographic Education site seeks to answer with a lively 35-minute activity designed for students between the ages of seven and eleven (second through fifth grade). In the activity, students use polystyrene foam balls and light bulbs to simulate the intensity of the sun's energy on the earth's surface. The site... http://education.nationalgeographic.com/activity/the-reason-...
 My NASA Data Lesson Plan: Seasons and Cloud Cover: Are They Related? This lesson plan uses NASA satellite data to correlate cloud cover over Africa to the solar declination. The four seasons on Earth have a scientific basis. The earth is tilted 23.5 degrees from vertical. This tilt and the Earth's orbit around the sun are the reasons for the seasons. Earth's tilt and orbital position cause differing angles at which the sun's rays hit the surface of the Earth. As... http://mynasadata.larc.nasa.gov/lesson-plans/50-minute-lesso...
 Astronomy Animations This collection of animations introduces students to planetary motions, gravitational effects, and the scale of astronomical distances. Students can view visualizations of Earth's changing seasons, circumpolar motion, and the celestial equator and ecliptic plane. Animations on gravity explain how satellites orbit, the motions of comets and meteor storms, and gravitational 'warping'. Other... http://ww2.valdosta.edu/~cbarnbau/astro_demos/
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