7 LETTERS

5. Something that is unfair; the state of being unfair
7. The state of being in a place or situation where there is no protection from sth harmful or unpleasant
9. How extremely bad or serious sth is
10. The production or sending out of light, heat, gas, etc
12. A chemical element which is a gas that is found in large quantities in the earth's atmosphere
13. A careful study of a subject, especially in order to discover new facts or information about it
14. The detailed study or examination of sth in order to understand more about it; the result of the study
15. A person who lives in a particular place or who has their home there

1. A mixture of different substances, usually ones that do not mix together
2. A very small piece of matter, such as an electron or proton, that is part of an atom
3. A young human who is not yet an adult
4. A continuous decrease in the number, value, quality, etc. of sth
6. A special activity or purpose of a person or thing
8. A way of solving a problem or dealing with a difficult situation
11. A level of quality, especially one that people think is acceptable
13. A reaction to sth that has happened or been said