Sublimation and boiling both happen at the surface of the substance. a. true b. false

This statement is: False

Boiling is vaporization that occurs both below and at the surface of the liquid.
However, evaporation happens at the surface of the substance.

So, if you need to correct this statement, the correction would be:
Sublimation and evaporation happen at the surface of the substance.

Is there a diagram/picture you can provide? it seems this question goes along with a

Decomposition is the cycle at which bacteria breaks down any organic material into the soil