Earth Science

2. Something revolving around another thing
4. The invisible line splitting the planet into the southern and northern hemispheres
6. The planet we live on
8. hot molten rock
9. The action of rotating around an axis or center
13. The weather in a certain area
16. The study of the sea
17. When you closely observe something and record results
20. The moon controls them
21. The remains or impression of a prehistoric organism
22. Someone who studies astronomy
23. The study of space and celestial bodies

1. The outer layer of earth
3. The study of the atmosphere
5. The movement of an object in a circular or elliptical course around another or about an axis or center
6. A specific point in history
7. Changing from liquid to gas
10. Something that is living
11. The study of rocks
12. A particular time of something
14. The state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc
15. A proposition made as a basis for reasoning, without any assumption of its truth
18. The National Aeronautics and Space Administration
19. An area with a distinct climate