| A | B |
| INTERFACE | a boundary |
| INSTRUMENT | extends the range of your senses |
| CLASSIFICATION | grouping things that have similar properties |
| DENSITY | concentration of matter in a substance |
| CYCLIC CHANGE | happens in a pattern (is predictable) |
| EQUILIBRIUM | when opposing forces are balanced |
| POLLUTION | harms the environment |
| 4 DEGREES C | temperature water reaches maximum density |
| MASS | how much matter something has |
| VOLUME | how much space something takes up |