Discussion
Lines drawn on a map joining places of equal atmospheric pressure are called
Answer: B
Correct answer: Isobars
Isobars join points of equal pressure, and they are what gives a weather chart its familiar look. Their spacing carries the important information: closely packed isobars mean a steep pressure gradient and therefore strong winds, while widely spaced ones mean light winds. Closed rings mark centres of high or low pressure, and in the northern hemisphere air spirals anticlockwise into a low and clockwise out of a high. The prefix iso-, from the Greek for equal, generates a whole family of such lines. Isotherms join places of equal temperature, isohyets places of equal rainfall, and contours places of equal height above sea level.
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