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

The Rocks and Minerals (ABDO); Core Library series by Jenny Fretland VanVoorst is at a Grades 5.1–6.1 reading level (average Grade 5.8). Intended for Middle Grades (Ages 9–12). There are 5 books in the series.

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

The Rocks and Minerals (ABDO); Core Library series has 5 books in order: 1. Fossils, 2. Gems, 3. Igneous Rocks, 4. Metamorphic Rocks (Rocks and Minerals), 5. Soil.

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

The Rocks and Minerals (ABDO); Core Library series is recommended for Middle Grades (Ages 9–12). The average content intensity is 1/5.

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

5 books by Jenny Fretland VanVoorst. Reading level: Grades 5.1–6.1. Middle Grades (Ages 9–12).

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. Rocks and Minerals (ABDO); Core Library (5 books by Jenny Fretland VanVoorst) lands at reading level Grades 5.1–6.1, with average content intensity 1/5. Intensity stays consistent across the series — a kid who can handle the first book can generally handle the rest.

The reading-order table below lists every book with per-volume reading level and intensity badges 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.

Books

Grades 5.1–6.1

Reading Level

1/5

Avg. Intensity

Middle Grades

Content Intensity Across the Series

Consistent

Content stays at a steady intensity level throughout the series.

First book Latest book

Rocks and Minerals (ABDO); Core Library Reading Order

#	Title	Reading Level	Content
1	Fossils Jenny Fretland VanVoorst	Level 5-6	Gentle
2	Gems Jenny Fretland VanVoorst	Level 6-7	Gentle
3	Igneous Rocks Lisa Owings	Level 5-6	Gentle
4	Metamorphic Rocks (Rocks and Minerals) Jennifer Swanson	Level 6-7	Gentle
5	Soil Rebecca Hirsch	Level 5-6	Gentle

All Rocks and Minerals (ABDO); Core Library Books

Fossils

Jenny Fretland VanVoorst

Fossils

Jenny Fretland VanVoorst

Level 5-6 Gentle

Gems

Jenny Fretland VanVoorst

Gems

Jenny Fretland VanVoorst

Level 6-7 Gentle

Igneous Rocks

Lisa Owings

Igneous Rocks

Lisa Owings

Level 5-6

Metamorphic Rocks (Rocks and Minerals)

Jennifer Swanson

Metamorphic Rocks (Rocks and Minerals)

Jennifer Swanson

Level 6-7 Gentle

Soil

Rebecca Hirsch

Soil

Rebecca Hirsch

Level 5-6 Gentle

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

What reading level is the Rocks and Minerals (ABDO); Core Library series?: The Rocks and Minerals (ABDO); Core Library series by Jenny Fretland VanVoorst is at a Grades 5.1–6.1 reading level (average Grade 5.8). Intended for Middle Grades (Ages 9–12). There are 5 books in the series.
What order should I read the Rocks and Minerals (ABDO); Core Library books?: The reading-order table above lists all 5 books with per-volume reading level and intensity ratings. Start with book 1 and read in publication order unless the table indicates a different recommended order for newer readers.
What age is the Rocks and Minerals (ABDO); Core Library series appropriate for?: The Rocks and Minerals (ABDO); Core Library series is recommended for Middle Grades (Ages 9–12). The average content intensity is 1/5. Check the intensity trajectory above to see whether content gets heavier across the series — if it does, sensitive readers may want to stop earlier in the run.