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Displaying 5 out
of 33
questions & answers.
atmosphere: the layer of air that surrounds the Earth
water cycle: the continuous exchange of water between the oceans, the atmosphere and land through evaporation, condensation and precipitation
normal lapse rate: the rate at which temperature decreases with altitude; in the troposphere, it is 6.5°C for every 1000 metres of ascent
auroras: natural displays of light that occur over the polar regions in the ionosphere
greenhouses: structures with glass roofs and walls, in which plants are cultivated under controlled
conditions
greenhouse gases: gases in the atmosphere such as ozone, carbon dioxide, water vapour and
methane that trap the heat of the Sun, and prevent it from escaping back into space
global warming: a steady increase in the temperatures across the globe, as a result of the increase in the amount of greenhouse gases in the atmosphere
Q1.
Fill in the blanks.
- Seventy-eight percentage of the atmosphere is made up of _______________________, and twenty-one percentage is made up of ______________.
- _______________ and _________________ are two inert gases found in the atmosphere.
- The _________________ is the densest layer of the atmosphere.
- The ozone layer blocks the _________________________ from reaching the surface of the Earth.
- Heavy use of synthetic fertilizers in agriculture releases _____________________ into the atmosphere.
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- Nitrogen, Oxygen
- Argon, Helium
- Troposhpere
- Ultra-violet radiation
- Nitrous Oxide
Q2.
Tick the sentences that are true. Correct the others.
- As we move outwards from the Earth's surface, the atmosphere gradually becomes thicker.
- Air temperature increases steadily with altitude.
- The mesosphere lies above the stratosphere.
- Greenhouses are called so because they are painted green in colour.
- The use of fossil fuels increases greenshouse gases in the atmosphere.
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- False
- False
- True
- False
- True
Q3.
Temperature increases with height in the stratosphere. Give reasons.
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Temperature increases with height in stratosphere as a result of the absorption of ultraviolet light by the ozone present here.
Q4.
The troposphere is also known as the 'weather-making layer'. Give reasons.
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answer not shownQ5.
The ozone layer is vital for life on the Earth. Give reasons.
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Ozone layer absorbs excess ultraviolet radiation from the Sun. Overexposure to ultraviolet radiation can damage our eyes and skin, and even lead to cancer.
