Earth Science (National Geographic); Reading Expeditions Books in Order
2 books by Glen Phelan. Reading level: Grades 5.9–6. 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. Earth Science (National Geographic); Reading Expeditions (2 books by Glen Phelan) lands at reading level Grades 5.9–6, 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.
Content Intensity Across the Series
ConsistentContent stays at a steady intensity level throughout the series.
Earth Science (National Geographic); Reading Expeditions Reading Order
| # | Title | Reading Level | Content |
|---|---|---|---|
| 1 | Uncovering Earth's History Glen Phelan | Level 5-6 | Gentle |
| 2 | Weather and climate Rebecca L. Johnson | Level 6 | Gentle |
All Earth Science (National Geographic); Reading Expeditions Books
Questions about the Earth Science (National Geographic); Reading Expeditions series
- What reading level is the Earth Science (National Geographic); Reading Expeditions series?
- The Earth Science (National Geographic); Reading Expeditions series by Glen Phelan is at a Grades 5.9–6 reading level (average Grade 6). Intended for Middle Grades (Ages 9–12). There are 2 books in the series.
- What order should I read the Earth Science (National Geographic); Reading Expeditions books?
- The reading-order table above lists all 2 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 Earth Science (National Geographic); Reading Expeditions series appropriate for?
- The Earth Science (National Geographic); Reading Expeditions 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.