| A | B |
|---|
| troposphere | closest to the Earth's surface |
| exosphere | layer of the atmosphere that merges into outer space |
| thermosphere | warmest layer of the atmosphere |
| mesosphere | coldest layer of the atmosphere |
| stratosphere | protects us by absorbing much ultraviolet radiation |
| stratosphere | contains the ozone layer |
| troposphere | where weather takes place |
| troposphere | contains the majority of the atmosphere gases |
| mesophere | burns up most metors |
| thermosphere | thickest layer of the atmosphere |
| exosphere | where the space shuttle flies |
| ionosphere | electrically charged particles are found primarily in this layer |
| ozone | a gas that protects us from harmful sunrays |
| conduction | the transfer of energy that occurs when molecules bump into one another |
| hydrosphere | all the water on Earth |
