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I'll solve this "What's the Matter?" worksheet by analyzing each puzzle to determine what happens when the two substances are combined.

Let me examine each row one by one:

First Row: Ice + Sun
- Ice is solid water
- Sun provides heat
- When ice is exposed to the sun's heat, it melts and turns into liquid water

Second Row: Water + Fire
- Water is liquid
- Fire represents heat/energy
- When water is heated by fire, it evaporates and turns into steam (water vapor)

Third Row: Water + Freezer
- Water is liquid
- Freezer provides cold temperatures
- When water is placed in a freezer, it freezes and turns into ice (solid)

Fourth Row: Steam + Cloud
- Steam is water vapor (gas)
- Clouds are collections of tiny water droplets or ice crystals suspended in the air
- When steam (water vapor) cools down in the atmosphere, it condenses to form clouds

Now I'll provide the complete solution for each puzzle:

1. Ice + Sun = Water (melting)
2. Water + Fire = Steam (evaporation)
3. Water + Freezer = Ice (freezing)
4. Steam + Cloud = Water droplets (condensation, though this one is a bit misleading as steam contributes to cloud formation rather than combining with an existing cloud)

The worksheet is teaching about states of matter and phase changes: melting, evaporation, freezing, and condensation.