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Learners model the ocean currents that carry hot water from the tropics to northern latitudes.

Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide.

This activity (on page 3 of the PDF under GPS: Cactus Activity) is a full inquiry investigation into how some desert birds keep their cool.

In this activity, learners explore in what ways the shape of the land and the pull of gravity influence how water moves over Earth.