Asked by amy

what allows water to change to all three states (liquid,gas,solid)

Answered by Ms. Sue
Hmmm! I'm far from being a science teacher, but I often change water (a liquid) into a gas and a solid in my kitchen.

Answered by Dr Russ
Pressure and/or temperature depending on where you are on the phase diagram.

There is an example of the water phase diagram here:

http://en.wikipedia.org/wiki/Phase_diagram
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