Index Contours
index contour
In some places there is, generally extremely far north or up in elevation.
Maps often provide elevation scales in both feet and meters to accommodate different measurement systems and ensure accuracy and clarity for users worldwide. Feet is commonly used in the United States, while meters is standard in most countries globally. By including both units on a map, it allows people from various regions to easily understand and interpret the elevation information.
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The definition of labeled is bearing or marked with a label or tag; "properly labeled luggage"
Contour maps.
I think it's an index contour, but I'm not sure.
Topographical lines
it is something i would know if i paid attention is science class. thats all i can say
just units
Called both Elevation Lines or Contour Lines
Sea level
index contour
1324ft
Because it is a length and so must have units of length.
690 feet
Hz is hertz which measures sound.