💡 Rocks Sand — Fun Facts

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.

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.

Sand can be many colours, even white, pink, or black.

The colour comes from the rocks and shells the sand is made of. Black sand often comes from cooled-down volcano rock.

Some rocks have sparkly bits inside called crystals.

Crystals grow in shiny shapes with flat, smooth sides. When light hits them, they can twinkle and glitter.

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.

Rivers can turn rough rocks into smooth, round pebbles.

Rocks tumble and bump along in the moving water for a long time. Slowly their sharp edges wear away and become smooth.

Sand is made of tiny bits of rock and shell.

If you look very closely, each grain of sand is a little stone. Waves and wind broke bigger rocks into these tiny pieces.