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26. When was “Clean Air Act” in United States came into force?

1950 1960 1970 1980

1970

In United States, reduction in acid deposition stem for Clean Air Act of 1970 and its Amendments in 1990. This Amendments begun by regulating of coal fired power plant emission. This development significantly reduced Sulphuric dioxide in United States.

Hint Answer

27. Natural sources also cause acid rain.

True False

True

The major natural causing agent for acid rain is volcanic emission. Volcanoes emit acid producing gases to create higher than normal amounts of acid rain or any or form of precipitation such as fog and snow.

Hint Answer

28. How many oxygen particles are re in every atom of ozone?

One Two Three Four

Three

Ozone is a type of oxygen that has three particles in every atom. The formation of ozone is extremely slow. Ozone gas is extremely toxic with a powerful odor. This toxic gas is harmful to environment.

Hint Answer

29. Why ozone within upper environment is important?

Because it provides rain to the earth It protects the earth from the sun’s harmful ultraviolet radiations It provides good aesthetic view to the atmosphere It protects the earth from floods

It protects the earth from the sun’s harmful ultraviolet radiations

Ozone within upper environment is important to all existence because it protects earth from harmful ultraviolent radiations. The ozone layer within upper atmosphere absorbs sun?s ultraviolent radiations and it prevents it to reach earth surface.

Hint Answer

30. Which of following is threat to ozonosphere?

Nitrogen dioxide Oxygen CFCs Carbon dioxide

CFCs

Ozone layer within atmosphere protects life on earth from harmful ultraviolent radiation from sun. Chlorofluorocarbons (CFCs) that were used as refrigerants and aerosol spray propellants expose a threat to ozonosphere.

Hint Answer

31. Which one of following is a result of ozone layer depletion?

Increase in the oxygen level Increase in the nitrogen level Increase in the phosphorous level Increases in the carbon dioxide level

Increases in the carbon dioxide level

The destruction of ozone layer causes harm to positive vegetation and to plankton and accordingly affecting nature?s food chains and food webs. This in turn causes an increase in carbon dioxide due to decrease in vegetation.

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32. Ozone at a ground level considered as a pollutant.

True False

True

Ozone is taken into consideration as a pollutant at ground level and constitutes a health risk. The health risks like inflicting respiratory ailments like allergies and bronchitis and or health related issues.

Hint Answer

33. In which layer of atmosphere ozone is very vital for all vegetation?

Upper atmosphere Below atmosphere Ground level Below ground level

Upper atmosphere

Ozone in upper atmosphere is vital to all forms of life as it protects earth from harmful UV radiations. Ozone at ground level is considered a pollutant at ground level and causes harm to vegetation.

Hint Answer

34. Which atom released when CFCs molecules are broken from UV radiations?

Oxygen Chlorine Nitrogen Arsenic

Chlorine

The CFC molecules are virtually indestructible until y reach level of stratosphere. In stratosphere UV radiations breaks m down to release chlorine atoms. These chlorine atoms react with ozone molecules to break m down into oxygen molecules.

Hint Answer

35. What is full form of CFCs?

Chlorofluorocarbons Chlorine fluorocarbons Chromate fluorocarbons Chlorofluridcarbons

Chlorofluorocarbons

CFCs stands for chlorofluorocarbons. In 1970s, scientists discovered chlorofluorocarbons, which are used as refrigerants and aerosol spray propellants, pose a threat to ozone layer.

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All Chapters

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Natural Resources

Natural Resources

Ecosystems

International Conventions and Protocols

International Conventions and Protocols

Environmental Pollution

Environmental Pollution

Forest and Wildlife Management

Forest and Wildlife Management

Social Issues and the Environment

Social Issues and the Environment

Background to International Efforts for Environmental Protection

Background to International Efforts for Environmental Protection

Human Population and the Environment

Human Population and the Environment

Biodiversity

Topics

This Chapter consists of the following topics

Social Issues and the Environment

When was “Clean Air Act” in United States came into force?

Natural sources also cause acid rain.

How many oxygen particles are re in every atom of ozone?

Why ozone within upper environment is important?

Which of following is threat to ozonosphere?

Which one of following is a result of ozone layer depletion?

Ozone at a ground level considered as a pollutant.

In which layer of atmosphere ozone is very vital for all vegetation?

Which atom released when CFCs molecules are broken from UV radiations?

What is full form of CFCs?

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