On a calm, sunny afternoon, where would you expect to find the warmest air in the troposphere?

At the very top of the troposphere, closest to the sun.

Just a few feet above the ground.

At an altitude where clouds typically form.

The temperature would be uniform throughout the layer.

Which of the following is the primary source of heat for the air in the troposphere?

Heat radiated from the Earth's surface.

Direct absorption of sunlight by air molecules.

Heat released by cloud formation.

Warmth coming from the upper layers of the atmosphere.

A microwave heating food from the inside out.

A person warming their hands over a hot stove burner.

A room getting warm from a heating vent in the ceiling.

Feeling the warmth of the sun directly on your skin.

Planet B, because the ice would reflect sunlight upwards, heating the air more intensely.

Planet A, because its dark surface would absorb more solar energy, which it would then radiate as heat.

Both would be heated equally because their atmospheres are identical.

Planet B, because the extreme cold of the ice creates a larger temperature gradient that drives heating.

The sun heats the upper atmosphere, and that heat is transferred down to the surface.

Sunlight passes through the atmosphere, is absorbed by the Earth's surface, which then radiates heat to the air above it.

Clouds in the atmosphere absorb direct sunlight and radiate heat downwards towards the surface.

The Earth's surface reflects sunlight, and this reflected light directly heats the air molecules.