Here's a crosssworrd puzzle to keep you thinking for some time. Listed below are hints that define different subject areas or research fields. All you need to do is follow the clue to guess the subject and fill in the correct answers - one letter per square, both across and down. We've sourced these definitions from the online version of the Merriam-Webster Dictionary and Thesaurus.
Hints
Down:
1. the scientific study of stars, planets, and other objects in outer space
2. the chemistry of living things
3. a branch of science that deals with plant life
4. the branch of science that involves the study of animals and animal behavior
6. a science that deals with matter and energy and the way they act on each other in heat, light, electricity, and sound
10. a science that deals with the relationships between groups of living things and their environments
11. a branch of medicine that deals with mental or emotional disorders
Across:
5. a science that studies the ocean
7. science that studies rocks, layers of soil, etc., in order to learn about the history of the Earth and its life
8. any of the sciences (as geology, meteorology, or oceanography) that deal with the earth or with one or more of its parts
9. a science that deals with the structure and properties of substances and with the changes that they go through (also the connection between two people)
11. the science or study of the mind and behavior
12. a science that deals with things that are alive (such as plants and animals
13. the study of language and of the way languages work