Question

The mining of oil shale requires _____. large amounts of water semi-arid conditions hot metal-rich fluids pressurized steam

Answer 1

The mining of oil shale requires large amounts of water.

Explanation (from wikipedia):

Depending on technology, above-ground retorting uses between one and five barrels of water per barrel of produced shale-oil. The water needed in the oil shale retorting process offers an additional economic consideration: this may pose a problem in areas with water scarcity.

Answer 2

The mining of oil shale requires LARGE AMOUNT OF WATER.
The processing of oil shale require large amount of water which is needed for the processing activities of oil shale. This is a big challenge to the mining of oil shale because most of oil shale deposits are found in semi arid regions where water is scarce.<span />