| A | B |
|---|
| Geosphere | All solid earth |
| Hydrosphere | Every form of water on Earth |
| Atmosphere | Air and gases that surround Earth |
| Biosphere | Living earth |
| Exosphere | Outer layer of the atmosphere; extremely thin |
| Troposphere | Atmospheric layer that contains clouds |
| Mesosphere | Coldest layer of the atmosphere |
| Troposphere | Bottom layer of the atmosphere |
| Stratosphere | Contains the ozone layer |
| UV Light | Type of light that causes sun burns |
| ozone | Gas that blocks UV radiation |
| Thermosphere | The ISS orbits the earth in this layer |
| Mesosphere | Meteors burn up in this layer |
| Nitrogen | 78% of air is made of this gas |
| Oxygen | 21% of air is made of this gas |
