Which of the following statements is true about ice formation conditions?

• A. Moisture present and temperature below 0 degrees.
• B. Moisture present and temperature above 0 degrees.
• C. Temperature below 0 degrees only.
• D. Moisture absent at any temperature.

Answer: (A)

Ice formation requires both moisture and freezing temperatures. When moisture is present and the temperature is below 0°C, the water changes to ice, so this combination describes the conditions needed for ice to form. If moisture is present but the temperature is above 0°C, the water remains liquid and ice won’t form. If the temperature is below freezing but there’s no moisture, there’s nothing to freeze. And if moisture isn’t present at any temperature, ice can’t form either. So the listed condition captures the necessary ingredients for ice to form.