The Earth

3. the method used to date something using the half life and radiometric decay
5. all the air surrounding the Earth
8. the outermost layer of crust and inner mantle of the geosphere
13. an atom that has more or fewer neutrons than its stable form
17. the entire solid part of the Earth including the surface and interior
18. the process of losing energy as neutrons decay
19. the type of rock formed from pieces of other rock and organic matter
21. two or more elements that have combined chemically
22. the wearing down of matter due to living organisms
23. when condensed water falls to the Earth
24. when water vapor cools into liquid form
25. the type of rock that forms when other rocks undergo extreme pressure and or heat
27. the movement of matter from one place to another
28. any compound that contains carbon

1. water in all forms in, on, an above the Earth
2. the weathering of matter as oxygen combines with metals to form other materials
4. the weathering of water due to acid rain
6. the cycling of all matter in, around, and on the Earth
7. the time required for half the amount of an element to decay
9. precipitation that runs off land into rivers, streams, etc
10. all living and formerly living things in, on, and above the Earth
11. the wearing down of matter through friction
12. the type of rock that forms from molten rock that cools and solidifies
14. the dumping of matter that has been eroded
15. when weathering occurs due to the formation of carbonic acid
16. a chemical element with the atomic number 6 found in all living things
20. any chemical that has not combined with another element
26. water vapor that leaves through the leaves of plants due to photosynthesis and cellular respiration