What is the transfer of thermal energy by electromagnetic waves?

Radiation

Explanation:

Radiation is the transfer of thermal energy by electromagnetic waves. In this form of energy transfer, no material medium is required.

It is through this form of energy transfer that allows heat to reach the earth surface from the sun.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.