| 单词 | crater floor |
| 释义 | crater floor Layers of emerging rock gradually formed a rocky dome of nearly 300 metres at the centre of the crater floor. canada.com These peaks are caused by the gravitational collapse of crater walls and subsequent rebound of the compressed crater floor. Retrieved from Wikipedia CC BY-SA 3.0 The crater floor has several small craterlets across its surface, and it has a low ridge near the midpoint. Retrieved from Wikipedia CC BY-SA 3.0 Several tiny craterlets lie across the crater floor. Retrieved from Wikipedia CC BY-SA 3.0 Deltas or fans are commonly present where a valley enters the crater floor. Retrieved from Wikipedia CC BY-SA 3.0 |
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