2 books · Ages 6–10
Geology for Kids is a 2-book series for ages 6–10 by Baby Professor. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Where Do Small Rocks Come From? Erosion and Weathering and Why Do Tectonic Plates Crash and Slip? are great first picks.
No particular order needed — browse and pick what catches your eye.