The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
Law of Conversation of Mass
The rule that energy cannot be created or destroyed.
Law of Conservation of Energy
The process by which molecules at the surface of a liquid absorb enough energy to change to gas.
Evaporation
The change in state from gas to a liquid.
Condensation
Any form of water that falls from clouds and reaches earth’s surface as rain, snow, sleet, or hail.
Precipitation
Parts of a System
Components
A group of objects or procedures that carry out a task.
System