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Free CLEP Science and Mathematics Exam Braindumps (page: 52)

Page 51 of 128
PDF with 494 Questions

Depletion of the ozone layer is of concern because ozone

  1. deflects infrared radiation from the sun
  2. helps maintain the molecular oxygen content of the earth
  3. is involved in the water cycle
  4. absorbs 99% of ultraviolet radiation emitted by the sun
  5. absorbs 99% of all radiation emitted by the sun

Answer(s): D

Explanation:

The bonds in ozone are able to absorb radiation with frequencies in the ultraviolet region of the electromagnetic spectrum. It would not be possible for life to exist on Earth if the majority of UV radiation were able to penetrate to the earth's surface.



The thin layer which floats on top of the earth's mantle is the

  1. asthenosphere
  2. outer core
  3. hydrosphere
  4. crust
  5. atmosphere

Answer(s): D

Explanation:

The outermost layer of the earth's surface is the crust. It floats on top of the mantle.



The movement of two tectonic plates away from each other results in

  1. mountain formation
  2. recycling of oceanic crust
  3. formation of new oceanic crust
  4. trench formation
  5. an earthquake

Answer(s): C

Explanation:

When two tectonic plates move away from each other, a gap is created. This gap is filled with lava, which forms the new oceanic crust.



Bio-organic farmers add compost to the soil to replace lost nutrients. This practice is superior to the use of chemical fertilizers because

  1. there is more leaching of the nutrients from the soil into ground water
  2. there is less leaching of nutrients from the soil into ground water
  3. it is economically advantageous to use organic matter
  4. it takes less time
  5. there is no difference in the methods except the politics behind them

Answer(s): B

Explanation:

The nutrients in commercial fertilizers are in the form of ionic salts that are very water-soluble compared to the bioorganic compounds in compost.






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