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Displaying 5 out
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questions & answers.
- Atmosphere: the blanket of air that surrounds the Earth
- Global warming: an increase in the average temperatures on Earth
- Greenhouse effect: the increase in atmospheric temperature due to the concentration of the greenhouse gases
- Greenhouse gases: gases which allow the Sun's rays to enter the atmosphere but prevent the heat from the Earth to radiate back into space
- Ions: electrically charged particles
- Mesopause: the boundary between thermosphere and mesosphere
- Normal lapse rate: the decrease in air temperature at the rate of 1°C for every 165 m increase in height
- Stratopause: the narrow boundary that separates the mesosphere from the stratosphere
- Troposphere: the narrow boundary that separates the stratosphere from the troposphere
Q1.
What is the composition of the atmosphere?
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Define the term 'normal lapse rate of temperature'.
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In the troposphere, the temperature of the air decreases with an increase in height at the rate of 1° C for every 165 m of ascent. This is called normal lapse rate.
Q3.
Mention two uses of carbon dioxide gas.
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Two uses of carbon dioxide are as follows -
- It is used by plants to produce food in the presence of sunlight (photosynthesis).
- It keeps the Earth warm.
Q4.
How is ozone gas important for us?
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Stratosphere contains ozone layer that absorbs harmful ultraviolet radiations of the sun and prevent them from reaching the earth.
Q5.
What do you understand by the greenhouse effect?
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