Concept:Solar energy travels through the vacuum of space and reaches Earth as electromagnetic waves. This mode of heat transfer is called radiation.
Explanation:The Sun is very far from Earth, and the space between them has no air or matter.
Heat cannot be transferred through empty space by conduction because conduction needs particles in contact.
Heat cannot be transferred by convection either, because convection requires a fluid medium such as air or water.
Instead, the Sun emits energy in the form of electromagnetic waves.
These waves travel across space and, when absorbed by the Earth's surface, warm it up.
This process of energy transfer through waves is known as radiation.
Answer:D. Radiation