Independent:
- Type of surfaces (metal, wax, paper, wood, plastic)
Dependent:
- Time taken for the ice cubes to melt
Controlled:
- The room, the experiment takes place in
- Amount of water used for each ice cube
- Type of water used to make ice cubes
- Thickness of each surface
- The amount of time it has been in the freezer
- The starting point for timing
- Quality of surfaces
- Brand of the surfaces
- Size of the ice cubes
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