| A | B |
|---|
| molecule | two or more atoms held together; particles of matter |
| water cycle | the movement of water through the earth's hydrosphere, atmosphere, and lithosphere |
| lithosphere | the solid portion of the earth |
| atmosphere | the layer of gases that surrounds the earth |
| hydrosphere | the water portion of the earth |
| water vapor | water in the form of gas |
| evaporation | when matter changes from a liquid to a gas |
| condensation | when matter changes from a gas to a liquid |
| precipitation | moisture that falls to the ground from clouds |
| mixture | two or more substances that are placed together but can be easily separated |
| dissolve | to spread evenly in a liquid and form a solution |
| solution | a mixture in which one substance spreads evely throughout another substance |
| surface tension | when water molecules cling tightly to one other at the surface forming a type of "skin" |
| pollution | the addition of harmful substances to land, air, or water |
