| 作者 (Author) | Zoehfeld, Kathleen Weidner |
| Summary: Photographs and easy-to-read text introduce rocks and minerals, covering the rock cycle, fossils, gemstones, and rock types. | |
| 等级 (MML) | MM Level-3.7 |
| 年级 (IL) | Lower Grades (LG K-3) |
| 字数 (Words) | 782 |
| 类型 (Fiction) | Non-Fiction |
| 系列 (Series) | National Geographic Kids; National Geographic Readers: Level 2; |
| Topic: Science-Geology; | |
