| A | B |
|---|
| Percentage of the Earth's atmosphere made up of nitrogen. | 78% |
| Percentage of the Earth's atmosphere made up of oxygen. | 21% |
| Percentage of the Earth's atmosphere made up of other gasses. | 1% |
| One of three other gasses included in Earth's atmosphere. | Methane |
| One thing our atmosphere protect us from? | radiation |
| Another thing our atmosphere protects us from. | meteoroids |
| Thin outermost layer of the atmosphere. | thermosphere |
| Layer of the atmosphere that protects us from meteoroids. | mesosphere |
| Layer of the atmosphere containing the ozone layer. | stratosphere |
| Layer of the atmosphere where weather occurs. | lowest troposphere |
| What word describes the measure of the average kenetic energy of a substance? | temperature |
| This phase of matter has a definite shape & volume. | solid |
| Which phase of matter has no definite shape or volume? | gas |
| This phase of matter has definite volume but no definite shape. | liquid |
| Phase described as low energy. | solid |
| Phase described as medium energy. | liquid |
| Phase described as high energy. | gas |
| Soild to liquid is an example of which phase change? Here you add heat & energy increases. | melting |
| Liquid to gas is an example of which phase change? Here you add heat and energy increases. | evaporation |
| Gas to liquid is an example of which phase change? Here you remove heat & energy decreases. | condensation |
| The amount of matter in an object. | mass |
| The amount of space an object takes up. | volume |
| Force exerted on surface air. | pressure |
| Mass per unit volume. | density |
