What reading level is the Core Library; Rocks and Minerals (ABDO) series?

Core Library; Rocks and Minerals (ABDO) books are at a grades 5–6 reading level (average grade level 5.5), and HootRated recommends the series for ages 9–12. There are 2 books in the series.

What order should I read the Core Library; Rocks and Minerals (ABDO) books?

Series numbers aren't available for most Core Library; Rocks and Minerals (ABDO) books, so HootRated lists them by publication date: Crystals (2015); Sedimentary rocks (2015).

What age is the Core Library; Rocks and Minerals (ABDO) series appropriate for?

HootRated recommends Core Library; Rocks and Minerals (ABDO) for ages 9–12. Content is gentle (HootRated intensity 1/5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.

Core Library; Rocks and Minerals (ABDO) Books in Order

Core Library; Rocks and Minerals (ABDO) is a 2-book series by Rebecca E. Hirsch for ages 9–12, at a grades 5–6 reading level, with gentle content (HootRated intensity 1/5).

Books: 2; By publication date
Reading level: Grades 5–6; Average grade level 5.5
Recommended ages: Ages 9–12; From HootRated age ratings
Content intensity: Gentle; HootRated 1/5

Core Library; Rocks and Minerals (ABDO) Reading Order

Series numbers aren't available for most Core Library; Rocks and Minerals (ABDO) books, so they're listed by publication date (oldest first).

#	Title	Reading Level	Ages	Content
1	Crystals 2015	Level 5-6	9-12	Gentle
2	Sedimentary rocks 2015	Level 5-6	9-12	Gentle

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

Series books grow with readers — but that's also the trap. Most series start at one reading level and one content intensity and drift upward over the course of the run. Core Library; Rocks and Minerals (ABDO) (2 books by Rebecca E. Hirsch) lands at a grades 5–6 reading level, with average content intensity 1/5. Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.

The reading-order table above lists every book with per-volume reading level, age and intensity ratings so you can spot any escalation before it catches your reader off guard. For a deeper dive into how we score text difficulty vs. emotional weight separately — and why series readers especially benefit from that split — see our methodology page.

All Core Library; Rocks and Minerals (ABDO) Books

Crystals

Rebecca E. Hirsch

Crystals

Rebecca E. Hirsch

Level 5-6 Gentle

Sedimentary rocks

Rebecca E. Hirsch

Sedimentary rocks

Rebecca E. Hirsch

Level 5-6

Series Like Core Library; Rocks and Minerals (ABDO): What to Read Next

Similar reading level, content intensity and themes.

Questions about the Core Library; Rocks and Minerals (ABDO) series

What reading level is the Core Library; Rocks and Minerals (ABDO) series?: Core Library; Rocks and Minerals (ABDO) books are at a grades 5–6 reading level (average grade level 5.5), and HootRated recommends the series for ages 9–12. There are 2 books in the series.
What order should I read the Core Library; Rocks and Minerals (ABDO) books?: Series numbers aren't available for most Core Library; Rocks and Minerals (ABDO) books, so HootRated lists them by publication date: Crystals (2015); Sedimentary rocks (2015).
What age is the Core Library; Rocks and Minerals (ABDO) series appropriate for?: HootRated recommends Core Library; Rocks and Minerals (ABDO) for ages 9–12. Content is gentle (HootRated intensity 1/5). Intensity stays consistent across the series, so a reader who can handle the first book can generally handle the rest.