Heat transport from sun to earth is accomplished primarily by

Heat transport from Sun to Earth is accomplished primarily by electromagnetic radiation.

Explanation:

We define radiation as the transfer of energy by particles or waves (as in this case) in a material medium or empty space.

The Sun is a star that emits radiation in the electromagnetic spectrum. Approximately 49% of it is in the near infrared part, 43% in the visible part (light), 7% in the UV part and the 1% left is a mixture of radio and gamma waves and X-rays.

Of the Sun's energy that reaches Earth around 30% is reflected by the atmosphere and the Earth, around 20% is absorbed by clouds and approximately 50% is absorbed by land and sea.

Radiation

Explanation:

Radiation is the transfer of heat from one material to another without a material medium or through a vacuum.

The heat from the sun gets transmitted to the earth through space through radiation of heat energy from the sun. This heat energy is transported as electromagnetic radiation.

Since there is no material medium between the earth and the sun, the earth primarily receives this heat through radiation.