Building rock tumblers is a project that can help children understand the geological process of the tumbling and smoothing of rocks in water bodies. A homemade rock tumbler is also a creative way of making polished rocks and stones for adornments.
Leaf stepping stones in gravel… In a bucket or pail, mix two cups of cement with 1 cup of water to create a thick paste. spread the cement mixture onto each leaf. Allow the cement to dry then Flip the mold over, and remove each leaf.