For which of the following phenomena is solar energy primarily responsible?

Wind is primarily driven by solar energy, which heats the earth unevenly and creates pressure differences that set air in motion.

Precipitation depends on the water cycle and condensation, in which solar heating plays only an indirect part.

Erosion of earth materials is chiefly the work of moving water, wind and ice acting on rock.

Since wind is the direct solar-driven answer, all of the above overstates the case.

Uneven heating of land, sea and air produces the pressure gradients that generate winds.

Wind energy is therefore an indirect form of harnessed solar energy.