2.Give each student 20 cards and allow them a few minutes to construct their cave. (100 cards per cave is a good number. )Encourage each group to name their cave. 3.Fill in any blank spaces in the students' caves with the limestone cards, making each cave into a rectangle. 4.Using the example on the board, show the students how to trace water from the surface to the groundwater.Explain that water will follow the path of least resistance.
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