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This video shows the UV Index or strength of ultraviolet radiation received at the surface of the Earth during each month of the year. The UV Index varies with seasons, the sun's angle, clouds, air pollution and land elevation. ClimateBits videos... (View More) are designed for Science On a Sphere (SOS) and also available on YouTube. Links are provided to more information for this topic from the main ClimateBits website (see related & supplemental resources). (View Less)
The tilt of Earth's axis as the cause of Earth's seasons is explained in text and illustrations. SciJinks is a joint NASA/NOAA educational website targeting middle school-aged children and their educators. It explores weather and Earth science... (View More) through articles, videos, images, and games. (View Less)
This article explains the causes of the summer and winter solstice. It also includes notes about the historical importance of solstices. SciJinks is a joint NASA/NOAA educational website targeting middle school-aged children and their educators. It... (View More) explores weather and Earth science through articles, videos, images, and games. (View Less)
This article explains the role of the tilt of Earth's axis on seasonal changes. An accompanying exploration dispels the commonly held misconception that distances between the sun and Earth are a factor. The article is targeted to children ages 10-12.