🔍 Key Concepts

• Steam fog forms when cold air moves over much warmer water, causing water vapor to evaporate and then quickly condense into fog just above the surface. • Compare air temperature vs. water temperature in each choice to see which has very cold air and relatively warm water. • Remember that steam fog often looks like "smoke" or "steam" rising from the water in very cold conditions.

💭 Think About

• In each option, identify which is colder: the air or the water, and by how much. • Ask yourself: which situation would cause a lot of evaporation from the water surface, followed by immediate condensation in very cold air? • Eliminate any option where the water is not significantly warmer than the air just above it.

✅ Before You Answer

• Verify which choice clearly has extremely cold air over warmer water. • Check that the process involved is evaporation from the water surface, not rain falling or cold water alone causing fog. • Confirm that the resulting fog would appear to "rise" from the water like steam in very cold weather.