Pumice is a low-density volcanic rock that consists of highly vesicular, rough, textured, volcanic glass, which may or may not contain crystals. It is typically light colored. Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. This simultaneous process freezes bubbles from gases being dissolved in the lava and preserves them in a matrix, which gives pumice its highly porous texture. Pumice's highly unique process of formation yields an extremely low-density rock; in fact, pumice is the one and only rock that will not sink in water! Pumice floats and bobs along the surface where other rocks would sink to the depths. Great for understanding density and can be used in classroom experiments.
Included: one 1" chunk of pumice
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
This adapter-powered butterfly uses Flexinor wires to create a realistic visual effect!
The Ball of Whacks is the perfect creativity tool for innovators, artists, engineers, writers, students, and you!
This is a great clean heat demonstration model for the classroom setting!
Create beautiful art with this amazing sun paper!
Perform awesome experiments using everyday materials found in any kitchen!
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