How many Earth's Landforms books are there?

There are 3 books in the Earth's Landforms series by Lisa J. Amstutz, for ages 4-8.

Earth's Landforms Books in Order — Wonderlit

Earth's Landforms is a 3-book series for ages 4–8 by Lisa J. Amstutz. Each book stands alone — start anywhere.

Start anywhere — each book stands alone.

That said, Caves and Islands are great first picks.

No particular order needed — browse and pick what catches your eye.