12 books · Ages 5–10
Children's Earth Sciences Books is a 12-book series for ages 5–10 by Baby Professor. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Introduction to Geology: Earth's Structure, Minerals, Types of Rocks, and Tectonic Plates and The Process of Weathering & Erosion are great first picks.
No particular order needed — browse and pick what catches your eye.