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| adjacent strata; associated beds; associated strata; attendant strata; country rock; roof and floor strata; strata; surrounding rock | |||
| πετρώματα: 72 phrases in 12 subjects |
| Chemistry | 3 |
| Coal | 2 |
| Earth sciences | 26 |
| Economy | 1 |
| Energy industry | 2 |
| Environment | 3 |
| General | 2 |
| Labor law | 2 |
| Life sciences | 12 |
| Metallurgy | 14 |
| Natural sciences | 4 |
| Technology | 1 |