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There will be several dark lines on a map, illustrating roads, power lines etc, BUT you probably mean contour lines. These are lines of equal altitude and are usually coloured brown for land, or blue for snow or ice fields.
The symbol for contour lines on a map is a series of equally spaced brown lines that connect points of equal elevation. These lines represent changes in elevation and help visualize the shape and relief of the land.
the lines on the map is called longitude and latitude.
The horizontal lines on a map or globe that indicate distance north or south of the Equator.
The critical rule for reading a map to determine grid coordinates is to first determine the longitude (vertical lines) and then the latitude (horizontal lines) on the map that intersect at the point of interest. The grid coordinates are then expressed as a combination of the longitude and latitude lines.
Brown lines
On a map, longitude lines go up and down, AKA vertically. Latitude lines are horizontal lines on a map.
There will be several dark lines on a map, illustrating roads, power lines etc, BUT you probably mean contour lines. These are lines of equal altitude and are usually coloured brown for land, or blue for snow or ice fields.
Contour lines on a map are typically brown or black in color. They indicate elevation changes on the map.
Blue on a map usually denotes water. Blue lines could be streams and rivers.
The black lines mean it is a state boundary.
grassland
Brown usually means desert.
Brown usually means desert.
Maybe forests, deserts, or mountains
There are really two answers to this: If you mean the vertical and horizontal lines, then yes, these are longitude and latitude. If however you mean the lines (particularly on older maps) that seem to run in diagonals almost like a compass...these are known as Rhumb lines and were used to help navigate between major cities or ports.
elevation above mean sea level