Thunder is caused by (Multiple Choice)

Thunder is caused by
   a. the collision between two thunderstorms with opposite electrical charge.
   b. the rapid heating of air surrounding a lightning channel.
   c. the explosion that occurs when + and - charge collide and neutralize each other.
   d. turbulent wind motions inside the thunderstorm.
   e. microbursts within the atmosphere.

Q. 2

A cloud-to-ground lightning discharge will sometimes appear to flicker. This is because
   a. you are able to see charges.
   b. you are barely able to distinguish separate return strokes.
   c. the bright light causes you to blink.
   d. of refraction caused by turbulent thunderstorm winds.
   e. your eyes momentarily get blinded by lightning.

Q. 3

An important principle in one of the theories of the electrification of clouds is that
   a. there is a net transfer of negative ions from a warmer object to a colder object.
   b. supercooled water is always negatively charged.
   c. ice crystals are always negatively charged.
   d. there is a net transfer of positive ions from a warmer object to a colder object.
   e. raindrops are always positively charged.

Q. 4

The upper part of a thunderstorm cloud is normally ____ charged, and the middle and lower parts are ____.
   a. negatively; neutral
   b. negatively; positive
   c. positively; positive
   d. positively; negative
   e. positively; neutral

Q. 5

Electrons
   a. are negatively charged.
   b. are positively charged.
   c. carry no charge.
   d. can carry either positive or negative charge.
   e. go back and forth between positive, negative, and neutral.

Q. 6

Distant lightning that is so far away you cannot hear the thunder is called
   a. sheet lightning.
   b. heat lightning.
   c. false lightning.
   d. St. Elmo's fire.
   e. auroral lightning.