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Not all isotherms run in an east-west direction, but most of them do. This is because latitude determines the temperature and climate of different regions. For example, the Tropics have higher temperatures than the Polar regions because it is closer to the equator. Lines of latitude run in an east-west direction, and thus isotherms, which is type of contour line or surface on a map that connects or indicates points of equal temperature, usually run in an east-west direction too.
Because the unequal distribution of land and water and ocean currents influence their direction.
Isotherms connect points of equal temperature on a weather map. The lines of isotherms naturally run parallel to each other. Their spacing indicates temperature variance.
middle of north america
That seems like a reasonable conjecture.
There are no countries on Antarctica.
Antarctica...
were latitude the only control of temperature the isotherms would run straight across the maps from east to west. Describe one region of the world where this hypothetical isotherm pattern is actually observed
The Antarctic Circle runs through the Southern Ocean, which surrounds Antarctica.
None.
New Zealand claims part of the Antarctic territory, but does not 'run' any of it. The Antarctic Treaty preserves the continent for the study of science. Claims are unacknowledged.
No point in the USA is less than about 5,900 miles from the Antarctic Circle.