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Pumice

usgb/ˈpʌmɪs/Volume
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LampPro Tip 1/3
Volcanic OriginPlay
Emphasize that pumice originates from volcanic eruptions, hinting at its natural, rough texture. SlideThe pumice at the beach comes from an ancient volcano.
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Floats on WaterPlay
Highlight pumice's unique ability to float, an unusual characteristic for a rock. SlideKids were amazed to see the pumice rock floating in the bucket.
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LightweightPlay
Point out that pumice is exceptionally lightweight, which contributes to its buoyancy. SlideShe easily carried the large pumice stone because of its light weight.