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Diamond is the hardest natural material on Earth.

Diamond is the hardest natural material on Earth.

A diamond is so hard that almost nothing can scratch it. It forms deep underground where it is very hot and squeezy.

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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.