I Wonder Why Knowledge Set, Age 6+ (6 Books)

I Wonder Why Knowledge Set, Age 6+ (6 Books)

1. Soap Makes Bubbles and Other Questions About Science
2. Spiders Spin Webs and Other Questions About Creepy-Crawlies
3. Pyramids Were Built and Other Questions About Ancient Egypt
4. The Sea Is Salty and Other Questions About the Oceans
5. Triceratops Had Horns and Other Questions About Dinosaurs
6. Snakes Shed Their Skin and Other Questions About Reptiles