sand - beach sand with a high percentage of glass grains - set of 5 tubes
For years residents at Ft. Bragg, California threw their trash over the bluff into the Pacific. Cars, old shoes, everything. Some time ago the trash was almost all cleaned up, but the glass remained to become part of the sand. Glass Beach is a part of a state park, where collecting is not permitted. However, the longshore current moves sand southward along the coast in California, and small coves south of the park have a high percentage of glass grains in the sand. In the state park, the beach is almost 100% glass grains.
Sand is made of whatever material is available, and this is a good example. The old shoes sticking out of the bluff haven't contributed, but the glass certainly has.
Set of five tubes, 16 ml each, optically clear polystyrene with screw caps. The plastic tubes are practical in a classroom and are somewhat student resistant, though a cap can be unscrewed.
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