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| резкая граница (Beneath the crust, seismic waves increase abruptly indicating a sharp boundary between the crust and upper mantle. ArcticFox) | |||
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| sharp boundary: 5 phrases in 4 subjects |
| Gold mining | 2 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 1 |
| Physics | 1 |