The conversation between human and AI assistant.
If it takes 2 hours to form a layer of ice 2 cm thick on the surface of a lake, after how many hours would the thickness of the ice get doubled?
Got it. Can you also tell me how thick the ice needs to be before it is safe to walk on?
Generally, the ice needs to be at least 4 inches or 10 centimeters thick to support a person's weight safely. However, this can vary depending on the temperature, the weight on the ice, and other factors.