地球被大气围绕英语作文

地球被大气围绕英语作文
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The Earth is surrounded by an atmosphere, which is a layer of gases that envelops the planet. This atmosphere plays a crucial role in supporting life on Earth. It
protects us from harmful radiation, provides us with the
air we breathe, and regulates the temperature of the planet.
The atmosphere is made up of several different gases, including nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. These gases are constantly moving and interacting with each other, creating weather patterns and climate conditions. They also help to distribute heat around the planet, ensuring that temperatures are not too extreme.
One of the most important functions of the atmosphere
is to shield the Earth from the Sun's harmful ultraviolet (UV) radiation. The ozone layer, a region of the atmosphere containing high concentrations of ozone molecules, absorbs much of this radiation, preventing it from reaching the
Earth's surface. Without this protective layer, life on Earth would be exposed to dangerous levels of UV radiation, which can cause skin cancer and other health problems.
In addition to protecting us from harmful radiation, the atmosphere also provides us with the air we need to survive. Oxygen, in particular, is essential for
respiration and the production of energy in our bodies. It is produced by plants through the process of photosynthesis and released into the atmosphere. We inhale this oxygen and exhale carbon dioxide, which is then used by plants for photosynthesis. This continuous cycle of oxygen production and carbon dioxide absorption helps to maintain the balance of gases in the atmosphere.
Furthermore, the atmosphere plays a crucial role in regulating the temperature of the planet. It acts like a blanket, trapping heat from the Sun and preventing it from escaping back into space. This phenomenon, known as the greenhouse effect, is essential for maintaining a stable climate on Earth. However, human activities, such as the burning of fossil fuels, have increased the concentration
of greenhouse gases in the atmosphere, leading to global warming and climate change.
In conclusion, the Earth's atmosphere is vital for supporting life on the planet. It protects us from harmful radiation, provides us with the air we need to breathe, and regulates the temperature of the planet. However, it is important for us to take care of the atmosphere and reduce our impact on it to ensure a sustainable future for generations to come.。