The outside layer of our planet is an active place. Earth's crust is always growing and changing. But do you know how Earth's crust forms? And what happens when its plates shift suddenly? Find out more about the moves that make mountains and ocean ridges in this interesting book!
The circulatory system is made up of the heart, the blood, and strong tubes called blood vessels. But what does the circulatory system do? And how do its parts work together to keep your body healthy? Explore the circulatory system in this engaging and informative book.