What is this?
freezing
What is this?
steam
What is this?
slime
What is this?
cola
What is this?
change
What is this?
solid
What is this?
burn
What is this?
evaporation
What is this?
condensation
What is this?
metal
What is this?
dissolve
What is this?
liquid
What is this?
gas
What is this?
melting