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Volcanoes make brand-new rock when their lava cools.

Volcanoes make brand-new rock when their lava cools.

Hot melted rock called lava flows out of a volcano. When it cools down, it turns hard and becomes solid new rock.

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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. 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. Diamond is the hardest natural material on Earth. Diamond is the hardest natural material on Earth.