ESS
Grade-9
Easy

Question

Statement I: The global atmosphere is currently warming.
Statement II: The depletion of the stratospheric ozone layer has increased the amount of ultraviolet radiation reaching the earth.

  1. Statement I is correct, statement II is incorrect.
  2. Statement I and II are correct.
  3. Statement I is incorrect, statement II is correct.
  4. Statement I and II are incorrect.

hintHint:

The greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.

The correct answer is: Statement I and II are correct.


    • Since the pre-industrial period, human activities are estimated to have increased Earth's global average temperature by about 1 degree Celsius (1.8 degrees Fahrenheit), a number that is currently increasing by more than 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade.
    • The depletion of the ozone layer leads, on the average, to an increase in ground-level ultraviolet radiation, because ozone is an effective absorber of ultraviolet radiation. The Sun emits radiation over a wide range of energies, with about 2% in the form of high-energy, ultraviolet (UV) radiation.
    • So both are correct 

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