Spontaneous

Tendency to occur
without needing to be driven
by external influence.

Dispersal of Energy		Dispersal of Matter
	May NOT be Fast. May require Initial input of energy. Increasing DISORDER can account for any spontaneous change.

American Heritage Dictionary:  
1. Happening or arising without apparent external cause; self-generated.
2. Arising from a natural inclination or impulse and not from external incitement or constraint.