Question 871Navigation General

70% to pass

Lines drawn through points on the Earth having the same atmospheric pressure are known as _______________.

A millibars
B seismics
C isobars
D isothermal
AI Explanation

The correct answer is C) isobars. Isobars are lines drawn on a map that connect points on the Earth's surface having the same atmospheric pressure. These lines represent the pressure distribution and are used to analyze weather patterns and frontal systems. The term "isobar" comes from the Greek words "isos" meaning "equal" and "baros" meaning "pressure". The other answer choices are incorrect: A) Millibars are the units used to measure atmospheric pressure, not the lines themselves. B) Seismics refer to the study of earthquake waves, which is unrelated to atmospheric pressure. D) Isothermal lines connect points of equal temperature, not pressure.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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