Rocks, Stones, and Petrified Bones
Rocks, Stones, and Petrified Bones
The rock factory
The earth is a rock factory. Scientists believe it has been making rocks for billions of years. The earth makes three different kinds of rocks. One kind is made from hot, syrupy liquids, deep inside…
Solid stuff
It takes a lot of things to make cookies—flour, milk, eggs, butter, sugar. But when the cookies are baked, you can’t see that there are a lot of things in them. Everything is all mixed together. A…
Flat sides and sharp corners
A chunk of mineral may seem to be just a jagged, lumpy, or twisty piece of hard stuff with no special shape. But each kind of mineral is actually made up of tiny shapes called crystals—shapes that…
A crystal garden
When small crystals of a mineral join together, they “grow” into larger crystals. You can see how crystals grow by growing some crystals yourself. Here’s what you will need: 6 tablespoons of water …
