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6. a solid having a highly regular atomic structure
8. material produced by changes in atoms or molecules
10. purifying a liquid by boiling it and condensing its vapors
11. a substance formed by chemical union of two or more elements
12. a chemical element or alloy that is usually a shiny solid
13. plant an industrial plant where chemicals are produced
14. oil a dark oil consisting mainly of hydrocarbons
16. radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particle
18. the process whereby fluids pass through a filter or a filtering medium

1. the act or means of getting rid of something
2. of or relating to commercial enterprise
3. engineering the branch of engineering that is concerned with the design and construction and operation of the plants and machinery
4. an artifact made of clay baked at a high temperature
5. fuel fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content
7. energy derived from the heat in the interior of the earth
9. atom with same atomic number, different number of neutrons
11. a reaction of a substance with oxygen to give heat and light
15. reaction in which nuclei combine to form more massive nuclei
17. a substance that cannot be separated into simpler substances