Science

2. the remains of something that has been destroyed
5. a small frozen mass that travels around the sun
6. what something is used for
12. a small celestial body composed of rock and metal
13. the distance that light travels in vacuum in 1 year
16. the part of the Earth consisting of crust and mantle
17. the sensory and control apparatus consisting of a network of nerve cells
18. the phenomenon when one celestial body obscures another
19. the weather in some location averaged over a period of time
20. the smallest component of an element

1. an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter
3. organisms interacting with their physical environment
4. the envelope of gases surrounding any celestial body
7. the basic structural and functional unit of all organisms
8. the watery layer of the earth's surface
9. a collection of star systems
10. small extraterrestrial body that hits the earth's atmosphere
11. a tentative insight that is not yet verified or tested
14. the simplest structural unit of and element or compound
15. rock altered by pressure and heat