What reading level is Earth's hidden treasures?

Earth's hidden treasures by Sandra Friend is at a Level 7-8 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is Earth's hidden treasures appropriate for?

Earth's hidden treasures is recommended for Ages 9-12. HootRating: 12C (Clear).

What genre is Earth's hidden treasures?

Earth's hidden treasures is nonfiction — Juvenile Nonfiction. Part of the Exploring Planet Earth series.

Does Earth's hidden treasures have any content warnings?

Earth's hidden treasures has a HootRating of 12C (Clear). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is Earth's hidden treasures?

Earth's hidden treasures by Sandra Friend is 64 pages (approximately 7,007 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

Earth's hidden treasures

Sandra Friend

Earth's hidden treasures

Age Rating, Reading Level & Content Guide

by Sandra Friend

Exploring Planet Earth

Reading Level 7-8 12C Ages 9-12 Sweet Spot Page-Turner

The text is written at a 7th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.

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About This Book

Discover the fascinating world beneath our feet as you explore different types of rocks, minerals, and sparkling gemstones. Learn how these natural treasures are formed and the many ways people use them every day. This captivating guide opens up the hidden wonders of the Earth in an exciting and easy-to-understand way.

Themes

Science & Nature Adventure

Quick Assessment

This is a Level 7-8 book with gentle content intensity. It's a Sweet Spot read — challenging text with gentle themes, ideal for advanced or 2e readers. No notable content concerns flagged. Written for readers ages 9-12.

Why we rated Earth's hidden treasures 12C

Earth's hidden treasures is written at a Level 7-8 reading level across 64 pages (approximately 7,007 words). Strong independent readers around grade 8.9 can typically handle this book on their own; with parent or teacher support, Earth's hidden treasures works for readers up to grade 9.9.

Read aloud, Earth's hidden treasures takes about 47 minutes, which fits within a single read-aloud session.

We rate Earth's hidden treasures as 12C ("Clear") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.

No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.

Thematically, Earth's hidden treasures weaves together science & nature and adventure.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about science & nature, adventure.
✓ Curious kids who prefer real-world topics over made-up stories.

Maybe not for

! Readers whose emotional readiness lags behind their decoding skills — this book's intensity outruns its reading level, a classic "gifted kid" mismatch.