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6. which of these conditions is required for the production of coal
- Swamp-like
- Aerobic
- Humid
- Temperatures Below 0
7. Why are pillars put into place
- to prevent subsidence and support the roof
- to ensure the environment can return to its natural state after mining is complete
- to preventthe coal sources from running out in a short period of time
8. which of these is a disadvantage for opencast mining?
- methane, CO2 and carbon monoxide can all accumulate within the mine
- can create noise and dust pollution
- there is a risk of floods and cave-ins
9. is the environment needed for coal to be formed anaerobic or aerobic
10. which of these processes are first in extracting coal from an opencast mine
- overlying soil is extracted and placed onto a separate pile
- overlying rock (overburden) is extracted and placed into a dump
- two access tunnels are drilled into the area of extraction
11. which of these is an advantage for opencast mining?
- does not create an eyesore for the environment?
- is flexible and can mine around the problems
- can mine under the sea
- can reach very deep coal seams
12. what year was the Aberfan Disaster?
13. which of these coal series are correct?
- peat, bituminous coal, anthracite, ignite
- peat, ignite, bituminous coal, anthracite
- anthracite, ignite, bituminous coal, peat
14. what material is used to support the tunnel roofs in longwall mining
- steel hoops
- hydraulic jacks
- titanium hoops
- iron hoops
