How do air masses interact to form a cyclone?

a. the coriolis effect bends global convection cells into a funnel pattern.
b. air moves in a spiraling pattern from centers of high pressure toward centers of low pressure.
c. cold, dense air flows toward the warmer, less dense air, so the cold front ends up moving faster than the warm front.
d. two air masses meet, but neither moves into the other one.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.