(Q).
Coal is used to produce electricity by burning in coal-fire power stations, and coal mines operated without electricity. Given these facts, what produces coal among the following options: - mines - tar - energy - copper - cars - state - Oak - fire
(A).
mines

(Q).
Being burried under soil and mud changes peat into coal through extreme heat and pressure in a swamp over a long period of time, and peat moss is the organic matter that mixes with soil to form peat. Given these facts, what being buried under mud changes peat into coal among the following options: - a hydraulic system - space matter - mud shoes - Water expanding - Physical weathering - organic matter - flow of electrons - insignificant matter
(A).
organic matter

(Q).
Stalactites are formed by deposition, and chrissospilia is a cave with stalagmites and stalactites. Given these facts, chrissospilias are formed by among the following options: - deposition - pressurization - condensation - cells - decomposition - Water expanding - erosion - tiny polyps
(A).
deposition