| A | B |
|---|
| composition | the chemical makeup of something |
| conserve | to keep a constant during a chemical/physical change |
| contracting | to reduce to smaller size by squeezing/forcing together |
| derived | to trace from a source/origin |
| expanding | to increase the size, volume, quantitiy |
| horizontal | relating to the junction of earth and sky |
| hypothesis | an idea based on what you have seen that may explain something |
| observation | the process of watching something to get information |
| overturned | to change a decision so that it becomes the opposite |
| periodically | happening again and again |
