Answer the following question given this paragraph: 

Radiation is the transfer of thermal energy by waves that can travel through empty space. When the waves reach objects, they transfer thermal energy to the objects. This is how the sun’s energy reaches and warms Earth.


Q: What is the transfer of thermal energy by waves that can travel through empty space called?

 Choices:

- convection

- induction

- vibration

- radiation

A:
radiation
