Which heat transfer process causes the warm air above the ocean surface to rise?

• A. Radiation
• B. Conduction
• C. Convection
• D. Evaporation

Answer: (C)

Convection is the process that causes the warm air above the ocean surface to rise. When the surface heats the air directly above it, that air becomes less dense than the surrounding air. In a fluid, less-dense (warmer) air rises while cooler, denser air sinks, creating a vertical movement called convection. This bulk motion transports heat upward through the atmosphere. Conduction would require direct contact to transfer heat, and radiation transfers heat via electromagnetic waves without lifting air. Evaporation involves a phase change and latent heat but isn’t the mechanism that makes the air rise.