Across
- 1. insoluble cap of iron oxides at the surface
- 4. a geological situation that concentrates petroleum in one place
- 5. insoluble products of chemical weathering
- 7. forms when minerals precipitate into a fracture
- 10. material is scraped or sucked from the river or sea bed.
- 13. metalladen solution produced by in situ or heap leaching.
- 14. long-term weather conditions affecting an area
- 17. when too little rock is extracted
- 18. mining from surface quarries
- 19. height difference between water table and water level in well
- 20. rotational downwards and outwards of movement of incompetent rock and material.
- 21. releasing water stored behind a dam to turn a turbine to generate electricity
- 22. zone of high grade ore just below the water table formed by secondary enrichment
- 23. impermeable rock that does not transmit water
- 25. horizontal tunnel dug into a hillside
Down
- 2. is a useful and valuable natural material
- 3. percentage of carbon in coal
- 6. comprise waste piled up on the ground
- 8. energy extracted from hot subsurface rocks or water
- 9. where water is injected below or natural gas injected above the oil to maintain pressure
- 11. liquids that do not mix
- 12. uncontrolled oil gush to the surface
- 15. large igneous intrusion below a volcano with a porphyritic texture.
- 16. where tributaries meet and water and sediment from other sources is added.
- 24. red tropical soil made of hydrated iron and aluminium oxides.