Question

Follow the clues and solve the terms you have learned.

Across:

1. A thick, black liquid with an unpleasant smell which is produced by heating coal in the absence of air (4, 3)

2. A dark-coloured, thick liquid found deep below the ground in certain areas (5, 3)

3. A hard, black, combustible mineral that consists mainly of carbon.

4. A natural fuel formed from the remains of living organisms buried under the earth long ago (6, 4)

Down:

2. A gaseous fuel obtained by the strong heating of coal in the absence of air during the processing of coal to obtain coke (4, 3)

3. A tough, porous, and black substance obtained by heating coal in the absence of air.

5. It is an industrial facility where the process of separating crude petroleum oil into more useful fractions is carried out (9, 8)

6. A flammable gas, which occurs naturally underground either alone or along with oil above the petroleum deposits (7, 3)

Accepted Answer

CROSS

1. Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. And it has unpleasant smell.

2. Crude oil is a naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels.

3. Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulphur, oxygen, and nitrogen.

4. A fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis that release energy in combustion.

DOWN

2. Coal gas is a mixture of gases chiefly hydrogen, methane, and carbon monoxide, obtained by the destructive distillation of coal and formerly used for lighting and heating.

3. Coke is a grey, hard, and porous fuel with a high carbon content and few impurities, made by heating coal or oil by destructive distillation.

5. An oil refinery or petroleum refinery is an industrial process plant where crude oil is transformed and refined into more useful products such as petroleum naphtha, gasoline, diesel fuel etc.

6. Natural gas, is a naturally occurring hydrocarbon gas mixture consisting primarily of methane.

Important Questions on Coal and Petroleum

Learn and Prepare for any exam you want !