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a scale with diffrent numbers
Vertical first.
Yes, intervals can be either on the Y Axis (Vertical), or the X Axis (Horizontal).
Open interval does not include its end points while closed interval includes
On a map that shows only a small part of the Earth's surface, the coordinate gridlooks like Cartesian " X and Y " coordinates. But as the map shows more and moreof the Earth, it starts to become apparent that the "lines" of latitude and longitudeactually represent polar coordinates on a sphere of constant radius.On a map that's sufficiently accurate, your first clue is this: Carefully measure thedistance between two of the 'vertical' lines, at the bottom of the map, and thenmeasure the distance between the same two lines at the top of the map. The twomeasurements are slightly different, because on a map of the full Earth, the 'vertical'lines all meet, at the north and south poles.