Earth's Atmosphere

Troposphere:

It is the lowest level of the atmosphere, where all weather takes place; it is a region of rising and falling packets of air. Depending on the latitude and the season, it can range from 6 to 17 kilometers thick. Most of the air surrounding the Earth, which is roughly 79 percent nitrogen and 21 percent oxygen found in the _________

Stratosphere:

Above the troposphere is the ________, where airflow is mostly horizontal. The ozone layer in the upper _________ has a high concentration of ozone, a particularly form of oxygen. The layer is primarily responsible for absorbing the ultraviolet radiation from the Sun. As you enter the _______ the temperature is about -60 degrees celsius

Mesosphere:

Above the stratosphere is the ________, which extends to about 90 kilometers above the Earth. As you enter the _________, the temperature starts to drop again, to as low as -90 degrees Celsius. This is where we see “falling stars” meteoroids that fall to the Earth and burn up in the atmosphere

Thermosphere:

Beyond the mesosphere, temperatures actually increase with altitude in the _________ because there is little matter to deflect solar radiation. Temperatures as high as 2,000 degrees Celsius have been recorded in the ________.