Explanation:

- The sun heats the Earth through:

- Option 2: Radiation

- The sun emits energy in the form of electromagnetic waves, which travel through space and heat the Earth.

- Option 1: Convection

- Refers to the movement of heat through fluids (liquids or gases) via the movement of the fluid itself.

- Option 3: Conduction

- Involves heat transfer through direct contact between materials.

- Option 4: Fission

- A nuclear process where an atom's nucleus splits, releasing energy.

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