How much of the world's surface is land and how much is water?
A common lesson plan is to show how much is water and how much is land. You have to imagine floating in a hot air balloon on a trip around the world. Suddenly the balloon starts losing air and you start descending....
Will you crash on water or land? Exactly where? Students can take turns catching a inflatable globe (about 5$) with the first right finger as the pointer. If you only have a spinning globe, each student takes a turn to stop the globe with one finger WITHOUT looking. That student then marks on the board whether they crashed land or water. Each student takes a turn. Because so much surface area is water the count will eventually be greater than land. Convert the counts on the blackboard into a graph. The students write a few simple sentences about why the graph looks the way it does.
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