Fact 1: Coal is used to produce electricity by burning in coal-fire power stations. Fact 2: Heat is essential to the burning process. Given the two facts above, how does coal produce electricity?
OPT:
(i) It remains dormant;
(ii) It gets cooled;
(iii) By rubbing together;
(iv) chemical reaction;
(v) It gets heated up;
(vi) major threat to health;
(vii) Through magnetism;
(viii) heat energy;
(v)