Earth's physical resources: extracting coal and oil - for iPod/iPhone

Transcript -- A fault is an underground hazard. By drilling a series boreholes, miners start the safe development of an open cast mine.

Transcript -- Open cast mines

Transcript -- Open cast mines | کست وایبز

Open cast mines

Extracting coal and oil

Transcript -- An introduction to this album.

Transcript -- Extracting coal and oil

Coal formation

Transcript -- Designing a system of mining to suit the split seams in the Northumberland coal field. Analysing the small detail reveals how it was formed.