Sources Of Energy

2. It's meaning in Latin is oil
4. It is a hard coal and contains over 90% carbon
6. The power that comes from coal, electricity, gas, etc. that is used for producing heat, driving machines, etc.
8. The substances which produce heat on burning in air.
11. It is the process of conversion of dead plant material into coal
12. The sources of energy which are inexhaustible

1. It is a hard and porous substance, It is made through the process of destructive distillation
3. It is a example of chemical energy, which is used in calculators, watches, clocks, etc.
4. It is a black and sticky solid, which is used in making roads
5. It is used as a fuel in smaller vehicles
7. It is made up of 30% carbon, and is the earlier stage in coal formation
9. It is used to run generators
10. It is a better alternative to other fuels which produce a lot of harmful gases