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Pumice is a rock so light that it can float on water.

Pumice is a rock so light that it can float on water.

This rock comes from volcanoes and is full of tiny air holes. The air makes it light enough to bob on top of the water.

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Sand is made of tiny bits of rock and shell. Sand is made of tiny bits of rock and shell. Rivers can turn rough rocks into smooth, round pebbles. Rivers can turn rough rocks into smooth, round pebbles. Volcanoes make brand-new rock when their lava cools. Volcanoes make brand-new rock when their lava cools. Some rocks have sparkly bits inside called crystals. Some rocks have sparkly bits inside called crystals. Sand can be many colours, even white, pink, or black. Sand can be many colours, even white, pink, or black.