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  • Question 1
    1 / -0

    The soil near the surface is usually darker than about one meter down, this is because the top soil:

  • Question 2
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    Which of the following chemicals is/are depleting ozone layer?

  • Question 3
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    The two forms of oxygen found in the atmosphere are:

  • Question 4
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    The best solution to combat greenhouse effect is

  • Question 5
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    Choose the incorrect statement among the following.

  • Question 6
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    World climate is threatened by an increase in the atmospheric concentration of _________.

  • Question 7
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    The principle green house gases are ____________.

  • Question 8
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    The pollutant emitted by paddy fields is _________.

  • Question 9
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    To prevent soil erosion, a farmer plants a hedge across a field. This method works because

  • Question 10
    1 / -0

    A lake with an inflow of domestic sewage rich in organic waste may result in

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