 |
| |||
| bed of clay; clay layer; impervious soil | |||
| clay bed; clay pan | |||
| clay bank; clay seam; clay stratum | |||
| layer of clay | |||
| |||
| argillaceous sediments | |||
|
Tonschicht : 9 a las frases, 6 temas |
| Carbón | 1 |
| Ciencia de los materiales | 1 |
| Ciencias de la vida | 1 |
| General | 1 |
| Minería | 4 |
| Transporte | 1 |