Answer: radiant to thermal
Explanation:
For every system, the law of conservation of energy is applicable which states that the energy of the system remains conserved. Energy can neither be created nor destroyed.
Radiant energy is the energy of electromagnetic waves. It is a form of energy that can travel through space.
Thermal energy is the total internal energy of the molecules present in the system.
When the sun warms the sidewalk on a hot sunny day, the radiant energy from the sun heats up the sidewalk and thus coverts the radiant energy into thermal energy.
