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Derived from the Science on a Sphere film entitled "Water Falls," this short (2:50) video presents basic information on the percentage, allocation, and distribution of Earth's usable water.
In this video-based activity, students learn that sea level is an average measurement of the height of the ocean, and sea level changes with the seasons and over time. El Niño and La Ninña events are compared, demonstrating that sea height is a... (View More) function of temperature.Summary background information, data and images supporting the activity are available on the Earth Update data site. To complete the activity, students will need to access the Space Update multimedia collection, which is available for download and purchase for use in the classroom. (View Less)