Life is possible on Earth primarily because
A) gamma rays and X-rays reach the surface.
B) the ozonosphere and ionosphere shield the surface from harmful radiation.
C) variable gases of all types exist in the atmosphere.
D) ultraviolet radiation reaches the surface.
E) ozone is evenly mixed throughout all levels of the atmosphere.
Correct Answer:
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Q10: Lewis Thomas,in his book The Lives of
Q11: Which is true of Earth's atmosphere?
A)it is
Q12: Based on temperature,the atmosphere is divided into
A)four
Q13: The thermosphere closely corresponds to the
A)ionosphere.
B)mesosphere.
C)homosphere.
D)exosphere.
E)ozonosphere
Q14: The outermost region of the atmosphere,based on
Q16: The thermopause is located
A)between the mesosphere and
Q17: The high temperature in the upper thermosphere
A)is
Q18: The heterosphere is the layer of the
Q19: The ionosphere
A)primarily absorbs harmful infrared wavelengths.
B)allows all
Q20: The thermopause refers to
A)Earth's magnetic field.
B)the solar
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