🌳 Đá & Cát
7 điều thú vị về Đá & Cát. Chạm vào một điều để đọc thêm.
Sand is made of tiny bits of rock and shell.
Rivers can turn rough rocks into smooth, round pebbles.
Volcanoes make brand-new rock when their lava cools.
Some rocks have sparkly bits inside called crystals.
Sand can be many colours, even white, pink, or black.
Diamond is the hardest natural material on Earth.
Pumice is a rock so light that it can float on water.