CROSSWORD

3. A substance that can both accept and donate a proton or H+
5. A region of space surrounding an astronomical object in which charged particles are manipulated or affected by that object's magnetic field
8. The study of viruses and virus-like agents
11. Scientific method of dating tree rings (also called growth rings) to the exact year they were formed
12. Second period of the Mesozoic Era
14. A region of the Solar System that exists beyond the eight major planets, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun
15. A quantity that characterises lack of order or predictability
16. The ratio of the speed of a body to the speed of sound in the surrounding medium
17. A severe allergic reaction that is rapid in onset and can cause death

1. A type of anxiety disorder in which you fear and avoid places or situations that might cause you to panic and make you feel trapped,helpless or embarrassed
2. A straight-sided clear container for holding liquid samples in a spectrophotometer or other instrument
4. A bright region on the surface of the sun, linked to the subsequent appearance of sunspots in the same area
6. Excessive richness of nutrients in a lake or other body of water,frequently due to run-off from the land, which causes a dense growth of plant life
7. The ratio of the speed of a body to the speed of sound in the surrounding medium
9. Chemical element with atomic number 111
10. A laboratory method used to detect specific RNA molecules among a mixture of RNA
13. A type of elementary particle and a fundamental constituent of matter