Refinery and hydrocarbon

1. ​a type of fuel oil that is made from petroleum and that is used in the engines of planes and for heat and light. 3. By doing it fuel produces heat, light or energy. 5. It combines with oxygen to form water. 6. To change or make something change from one thing to another. 7. ​a substance that flows freely and is not a solid or a gas, for example water or oil. 9. The force or weight with which something presses against something else. 10. A group of atoms that forms the smallest unit that a substance can be divided into without a change in its chemical nature. 11. Area where something is being carried (usually in large amounts) by a person, vehicle, etc. 12. A substance made by combining other substances together. 14. A gas without colour or smell, that burns easily and is used as fuel. Natural gas consists mainly of it. 16. A ship or lorry that carries oil, gas or petrol in large quantities. 17. O make something empty or dry by removing the liquid from it; to become empty or dry in this way. 18. A chemical element. It is found in all living things, existing in a pure state as diamond and graphite. 21. To put something somewhere and keep it there to use later. 22. Tube through which liquids and gases can flow. 23. ​a fuel that is a mixture of gases kept in a liquid form by the pressure in a container.

2. To make electrical equipment safe by connecting it to the ground with a wire. 3. A black sticky substance obtained from oil, used for covering roads or roofs. 4. A factory where a substance such as oil is made pure. 5. ​a chemical made up of hydrogen and carbon only. 8. To divide into different parts or groups; to divide things into different parts or groups. 13. A series of connected things or people. 15. ​a gas that has no colour or smell and that can burn. It is found in natural gas and mineral oil. 19. ​a type of oil that starts burning very easily, used as fuel or in making chemicals. 20. Any material that produces heat or power, usually when it is burnt.