A substance or layer that underlies something, or on which some process occurs, in particular.
• the surface or material on or from which an organism lives, grows, or obtains it's nourishment.
• the substance on which an enzyme acts.
Condensation is the process by which water vapor in the air is changed into liquid water. Condensation is crucial to the water cycle because it is responsible for the formation of clouds.
I'm sorry but can you be a bit more specific on these following observations?
