 |
| |||
| 巨火山口 | |||
| 火山洼地 | |||
| 火山口 | |||
| 火口洼地; 火山喷口; 破火山口 | |||
| 破火山口 土地要素 | |||
| 火山喷口 | |||
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| 卡尔德拉 (哥斯达黎加，N9°56' W84°44') | |||
| caldera: 20 phrases in 6 subjects |
| Desert science | 1 |
| Engineering geology | 4 |
| Geography | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 5 |
| Technology | 7 |
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