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It is the supply of oxygen to the heart; the oxygen is carried by the blood. When there's insufficient blood supply, oxygen supply is low too, and angina results. See http://en.wikipedia.org/wiki/Angina_pectoris
I think carbonisation is the word, the end result is charcoal.
It is more plentiful, most likely a never ending supply. It is renewable (through the natural process of evaporation/rain). It requires no refining (processing). It is cleaner, no emissions, better for the environment. It is safer (no refinery explosions or oil spills).
A drought is an extended period of months or years when a region notes a deficiency in its water supply. Generally, this occurs when a region receives consistently below average precipitation. It can have a substantial impact on the ecosystem and agriculture of the affected region. Although droughts can persist for several years, even a short, intense drought can cause significant damage or harm the local economy.
Yes, fracking can harm the water supply.
condensation, precipitation, and evaporation
Earth's water is continuously recycled through evaporation and precipitation, so there is a continuous supply of water for use.
precipitation
as insufficient oxygenated blood supply to brain
the decline of prices due to insufficient money supply A+
Ischaemia
rbc
Evaporation.
angina
Insufficient oxygen supply to the cornea, basically.
Probably, there will be a drought.
Prepositions would include "for" or more rarely "in."NOTE THAT THE WORD "to" following insufficient is normally part of an infinitive verb, not a preposition. E.g. The supply was insufficient to meet the demand.