Doing "What affects the freezing rate of water".

Equipment:
Plastic cups
Water
Freezer
Equal amounts of soil, salt, staples, sugar, etc.
Alarm

Repeat experiment every Saturday to ensure accurate results.

Independent Variables

• the materials placed into the water
  

Dependent Variables

• the freezing rate
  

Controlled Variables

• all cups are placed closely together in the freezer.
• the amount of water is equal.
• the amount of soil\salt\sugar\etc is equal.
• temperature of the freezer.
• the 30 minute time span before re-checking the cups.