| A | B |
|---|
| troposphere | lowest layer of the atmosphere |
| stratosphere | second layer of the atmosphere |
| stratosphere | contains the ozone layer |
| mesosphere | third layer of the atmosphere |
| mesosphere | protects Earth's surface from being hit by most meteoroids |
| thermosphere | outermost layer of the atmosphere |
| layers of the atmosphere are divided | according to CHANGES in temperature |
| the thermosphere has two parts | ionosphere and exosphere |
| troposphere | layer that humans live in |
| conditions change often in this layer | troposphere |
| weather occurs in this layer | troposphere |
| shallowest layer(0-12km) | troposphere |
| when increasing in altitude in the troposphere | the temperature DECREASES |
| the temperature at the top of this layer is about -60 degrees C | troposphere |
| layer directly above the troposphere | stratosphere |
| this layer extends to about 50 km above the Earth | stratosphere |
| cirrus clouds are found at the top of this layer | troposphere |
| although the lower part of this layer is cold, the UPPER part is WARMER | stratosphere |
| Job of the ozone layer | absorbs or traps the sun's energy and converts it to heat making the air warm |
| mesosphere | layer directly above the stratosphere |
| middle layer of the atmosphere | mesosphere |
| thickness equals 50km-80km | mesosphere |
| thermosphere | top layer of the atmosphere |
| this layer has no definite outer limit | thermosphere |
| this layer blends with outer space | thermosphere |
| air is very THIN in this layer | thermosphere |
| temperatures are highest in this layer | thermosphere |
| air thin, very high temperature, sunlights strikes this layer FIRST | thermosphere |
| the two layers of the thermosphere | ionosphere and exosphere |
| lower layer of the thermosphere (80-400 km) | ionosphere |
| outer layer of thermosphere (above 400km) | exosphere |
| ionosphere | has radio waves reflecting back to Earth |
| aurora borealis(Northern Lights) | found in the ionosphere |
| exosphere | contains communication satellites orbitting Earth |
