straight line
When a contour line crosses a river or stream, they make a "V" shape and points to the direction the river is flowing.
V
(2) 15 to 20 feet/mile
(2) 15 to 20 feet/mile
It makes it easier to count the number of contour lines.
it is a contour line of elevation Control index contour, or just index contour
The point of the V is probably where there is a stream, river or wash.
i am not know but plz tell me any one
create a sentence for contour line
Contour lines don't really "cross" if we consider them strictly. But they can "merge" at a point where there is an abrupt change in elevation, as a cliff. Let's look at things a bit more closely. If we map a hill with one side cut straight down by something like a quarry or the action of a river, we'd see contour lines on a map coming together to "merge" along the face of the cliff. There are "multiple elevations" represented by the face of the cliff, and two or more lines might become one line along what is the cliff face on our map.
The river - but why didn't you just google it?
A contour line is a line defining elevation on a map.