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a contour line joins places of equal elevation
Air pressure.
Lines of Barometric pressure
Lines of equal summer temperature are Isothere. Lines of equal general temperature are Isotherm
On a weather map, high wind speeds are indicated where thin lines with arrows are spaced close together. This indicates strong winds and the direction in which they will move.
isonephs
Contours..
a contour line joins places of equal elevation
Isohytes are lines drawn on maps joining places of equal rainfall.
isotherms
isotherms
Those lines are "isobars."
isobars
Air pressure.
isohyet
lines on a map joining points of equal atmospheric pressure
Lines on a map joining points of equal height above or below sea level.