The contour lines drawn on a 500 mb chart are lines of constant:a. pressure. b. altitude. c. ...

The contour lines drawn on a 500 mb chart are lines of constant:a.
   pressure.
  b. altitude.
  c. density.
  d. wind direction

Low __________ on a constant height chart corresponds to low __________ on a constant
  pressure chart.
  a. pressures, pressures
  b. pressures, heights
  c. heights, pressures
  d. heights, heights

On an isobaric surface,
  a. altitude is constant.
  b. temperature is constant.
  c. pressure is constant.
  d. both a and c

Pressure changes:a.
   more rapidly in the horizontal direction than in the vertical.
  b. more rapidly in the vertical direction than in the horizontal.
  c. at the same rate in the horizontal and vertical directions.
  d. more rapidly in the vertical over land than over the ocean.

Lines connecting points of equal pressure are called:a.
   isobars.
  b. millibars.
  c. contours.
  d. isotherms.
  e. a coordinate grid.