Because contour lines make places of equal height.
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Because then the point of intersection would have to be two different altitudes like if a 290 feet and 300 feet countor lines cross it would have to be both 290 and 300 feet altitude at the same time which is impossible
Two lines cross at a point.
Two lines cross or intersect at a point.
The location two lines cross or intersect is called a vertex.
The elevation of a point that falls between two contour lines can be approximately determined by averaging the elevation of those two points. Assuming the point is somewhat halfway between the lines, this can be done by adding the elevations and dividing by two.