1 - e. water and b. carbon dioxide
2. Denver and Mt. Everest and Death Valley and Moon
3. The triple point is the point at which the compound (in this case CO2) is at a state of equilibrium between the three phases - solid, liquid, and gas. It is able to take on any of the three states if nudged in one direction or the other
4. The triple point is different for different substances depending on the temperature and pressure needed to make that compound a solid, liquid, or gas.
5. Temp and pressure
6.Used as a solvent
7. deposition