What reading level is Life on Earth?

Life on Earth by Peter D. Riley is at a Level 7 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is Life on Earth appropriate for?

Life on Earth is recommended for Ages 9-12. HootRating: 12C (Clear).

What genre is Life on Earth?

Life on Earth is nonfiction — Juvenile Nonfiction. Part of the Making Sense of Science series.

Does Life on Earth have any content warnings?

Life on Earth 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 Life on Earth?

Life on Earth by Peter D. Riley is 32 pages (approximately 6,875 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

Life on Earth

Peter D. Riley

Life on Earth

Age Rating, Reading Level & Content Guide

by Peter D. Riley

Making Sense of Science

Reading Level 7 12C Ages 9-12 Sweet Spot

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

Explore the incredible variety of living things on our planet, from tiny insects to towering trees, and discover how scientists organize them into groups. Journey through diverse habitats to see how plants and animals interact and depend on each other in nature's web of life.

Themes

Science & NatureBiologyEducation

Quick Assessment

This is a Level 7 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 Life on Earth 12C

Life on Earth is written at a Level 7 reading level across 32 pages (approximately 6,875 words). Strong independent readers around grade 8.0 can typically handle this book on their own; with parent or teacher support, Life on Earth works for readers up to grade 9.0.

Read aloud, Life on Earth takes about 46 minutes, which fits within a single read-aloud session.

We rate Life on Earth 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, Life on Earth explores science & nature, biology, and education — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Readers who like a steady plot with enough momentum to keep pages turning.
✓ Kids drawn to stories about science & nature, biology, education.
✓ Readers who fall hard for one book and want a long series to live in — there are 6 more books in the Making Sense of Science series.
✓ 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.