How Things Work

Colors we see

The cheese in your sandwich is orange. The tomato is bright red. The lettuce is green. The light brown bread has a dark brown crust. You would be surprised if your sandwich had red cheese, a brown…

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About Animals

Hiding with color

Hop! A green grasshopper shoots up out of the grass. It sails through the air and lands in the grass again. You can’t see it before it jumps. And you can’t see it after it comes down. Its green color…

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Mountains, Valleys, and Plains

The birth and death of a mountain range

Mountain ranges rise where a sea once met a shore. They start to form when a sea bottom along the edge of a continent begins to fill up with mud and sand. As the mud and sand grow thicker, the sea…

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