Sometime billions of years in the future, he predicts, the core and mantle could cool and solidify enough to meet the crust. If that happens, Earth will become a cold, dead planet like the moon. Long before such an occurrence, however, the Sun will likely have evolved into a red-giant star, and grown large enough to engulf our fair planet.
The term increment is occasionally used in physics and engineering to represent a small change in a parameter such as temperature, electric current, visible light intensity, or time. Also see Mathematical Symbols.
No, increase cannot always replace increment. In mathematics, increment can refer to a decrease. An increase, on the other hand, always refers to the act, amount or rate of getting larger. That said, in common usage, an increment is an increase, generally with the specific connotation of being: one of a series of regular additions or contributions.