Instructions: Choose one answer from each pair of selections. Some studies suggest that cities might ...

Instructions: Choose one answer from each pair of selections. Some studies suggest that cities might modify their local climate and cause MORE  LESS precipitation to fall in the city than in the surrounding countryside.

Question 2

Without the atmospheric greenhouse effect, the average surface temperature of Earth would be ___.
 A) higher than at present
  B) lower than at present
  C) the same as it is now
  D) much more variable than it is now

Question 3

What is the most accurate description of the principle of a lightning rod?
 A) The lightning rod acts to discharge the thunderstorm.
  B) The lightning rod intercepts the lightning and safely carries the lightning current around the object it protects.
  C) Lightning rods have been used since the 1700s, but the principle of their operation is not known.
  D) A positive charge induced in the lightning rod repels the negative charge in an approaching step leader.

Question 4

Instructions: Choose one answer from each pair of selections. A greater mixing depth would most likely be associated with a(n) STABLE  UNSTABLE atmosphere.

Question 5

The atmospheric greenhouse effect is due primarily to the fact that ___.
 A) oxygen and ozone absorb ultraviolet radiation
  B) nitrogen and oxygen transmit visible radiation
  C) cloud formation releases latent heat energy
  D) carbon dioxide and water vapor absorb infrared radiation

Question 6

As the electric potential near the ground increases during a thunderstorm, a positive charge current can move up pointed objects, such as masts of ships, producing a luminous halo or glow known as ____.
 A) red sprite
  B) St. Elmo's fire
  C) blue jet
  D) ball lightening

Question 7

Instructions: Choose one answer from each pair of selections. At night, cold air and pollutants move UPHILL FROM  DOWNHILL TO low-lying valleys.