If a cold front moves into a moist region, A) humidity will ...

[frankwu]

If a cold front moves into a moist region,
 
  A) humidity will likely decrease.
  B) the chances of precipitation will increase.
  C) evaporation will increase.
  D) photosynthesis will increase.

Question 2

Consider how easily halite (NaCl) dissolves in water. Why does quartz not dissolve readily in water?
 
  What will be an ideal response?

[kiamars2010]

Answer to Question 1

B

Answer to Question 2

Halite dissolves relatively easily because it forms from ionic bonds of elements that only have a charge value of one. Weak attraction results from lopsided distribution of electrons; positive ends of the water molecule (H+) are attracted to and dislodge the anions (Cl-) and the negative ends of the water molecule (O-) are attracted to and dislodge the cations (Na+). Water keeps the ions separated. In contrast, bonds in quartz are mostly covalent.