Ruby 2: Liquid, Gas or Solid?

1. air ✓
2. less dense ✓
3. moon ✓
4. water x
5. outline the various forms water can take, and why and how it changes ✓
6. a chemical substance essential for life ✓
7. non-living things ✓
8. compacted ✓
9. underground supplies of fresh water ✓
10. ice ✓
11. its chemical structure needs to change x
12. water is the only substance which can be found in all three states in nature ✓