Fill in the Blanks The layers of the atmosphereOnline version Complete the blanks with the right word. by Anna Bízková Doleželová 1 radiation ozone mesosphere weather surface temperature thermosphere rise mass height stratosphere solar troposphere The atmosphere can be divided vertically into four layers based on . The bottom layer , where temperature decreases with an increase in altitude , is the . It is in this layer that essentially all important phenomena occur . The thickness of this layer is not the same everywhere . It varies with latitude and the season . On average , the temperature drop continues to a of about 12 kilometres , where the outer boundary of the troposphere , called the tropopause is located . Beyond the tropopause is the . Here , the temperature remains constant to a height of about 20 kilometres . It then begins a gradual that continues until the stratopause at a height of nearly 50 kilometres above Earth's . Temperatures increase in the stratosphere because the atmosphere's is concentrated here . It absorbs ultraviolet from the sun and , as a result , the stratosphere is heated . In the third layer , the , temperatures again decrease with height until the mesopause . The mesopause is more than 80 kilometres above the surface and the temperatures approach ? 90°C . The fourth layer extends outward from the mesopause and has no well - defined upper limit . It is the , a layer that contains only a tiny fraction of the atmosphere's . Temperatures increase here because oxygen and nitrogen absorb short - wave , high - energy radiation .
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