Stratosphere Study Guide
What is the stratosphere?
The stratosphere is the second layer of Earth's atmosphere, extending from about 10 to 50 kilometers above the Earth's surface. It is characterized by the presence of the ozone layer.
What is the ozone layer?
The ozone layer is a region of the stratosphere where ozone molecules (O3) are concentrated. These molecules absorb and scatter a significant portion of the sun's ultraviolet (UV) radiation, providing a shield that protects life on Earth from harmful UV rays.
What is the importance of the ozone layer?
The ozone layer is crucial for life on Earth, as it helps protect living organisms from the harmful effects of UV radiation. Without the ozone layer, increased exposure to UV radiation could lead to higher rates of skin cancer, cataracts, and other health problems in humans, as well as potential damage to ecosystems and wildlife.
What are some key features of the stratosphere?
One notable feature of the stratosphere is the presence of temperature inversions, where the temperature increases with altitude. This is due to the absorption of UV radiation by the ozone layer, leading to a warming effect in the upper stratosphere.
How does the stratosphere differ from the troposphere?
The stratosphere is distinct from the troposphere, the layer of the atmosphere directly below it. Unlike the troposphere, where temperature decreases with altitude, the stratosphere exhibits a temperature increase due to the presence of the ozone layer.
What are some human impacts on the stratosphere?
Human activities, particularly the release of certain chemicals such as chlorofluorocarbons (CFCs) and halons, have been linked to the depletion of the ozone layer. These substances can break down ozone molecules, leading to the formation of the infamous "ozone hole" in certain regions, particularly over Antarctica. International efforts, such as the Montreal Protocol, have been instrumental in phasing out the use of these ozone-depleting substances to protect the ozone layer and mitigate the effects of ozone depletion.
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