Question

which process causes earths surface to warm?
the conduction of heat by air above earths surface
the radiation of the suns electromagnetic waves
the convection of warm air from the atmosphere
the reflection of electromagnetic waves off bodies of water

Explanation:

To determine the process that warms Earth’s surface, we analyze each option:

• Conduction by air above the surface: Air is a poor conductor, so this is not the main warming process.
• Radiation of the Sun’s electromagnetic waves: The Sun emits electromagnetic radiation (like visible light, infrared) that travels through space and reaches Earth’s surface, transferring energy and warming it. This is the primary way Earth’s surface gets heat from the Sun.
• Convection of warm air from the atmosphere: Convection moves heat within the atmosphere, but the initial heat source for the atmosphere (and surface warming) comes from solar radiation, so this is not the cause of surface warming.
• Reflection of electromagnetic waves off water: Reflection would bounce waves away, not warm the surface.

Answer:

B. the radiation of the Sun’s electromagnetic waves