What happened to the people, trees, houses, plants and animals as you spray the mound of soil?
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Place little plastic figures like plastic people, tiny houses, model trees, etc., in different places around the mound of dirt. Use a spray bottle or hose to spray the mound until the dirt starts to erode. Watch the people, houses, and trees slide down the mound. Measure the amount of runoff. Drain the water and only measure the amount of soil runoff.
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