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Topographic Investigation: Map an Underwater Surface
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In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made.
Measure the Sun's Size
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In this activity, learners make their own pinhole viewer in order to measure the size of the sun.
Turbidity
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This is an activity about turbidity, or the amount of sediment suspended in water.