| Knowledge Item Name | atoll |
| Curve | Normal |
| Question/Answer | |
| Review Date | 2022/10/21 8:27:31 |
| Next Review Date | 2025/6/3 16:35:48 |
| Review Times | 18 |
| I live on an atoll |
| An atoll is a ring of coral rock, or a group of coral islands surrounding a lagoon. |
| Grade | Easy Factor | Review Date | Next Review Date | |
|---|---|---|---|---|
| 5 | 2.5 | 2022/10/21 8:27:31 | 2025/6/3 16:35:48 |