A contour line is a line of 'equal height': every point on a contour is the same height above sea level.
The closer any two contour lines are the steeper the hill is: and the further apart they are the move level the ground.
If a group of contour lines suddenly move to form a V shape then the hill either has a promontory sticking out from it or a valley in it.
Answer: the radius of earth is 3,958.8 mi
Explanation:
The three rivers shown are the Volga 1, Ob 2 and Lena 3 all in Russia and the Danube is not shown because it is not in Russia but flows in behind the Adriatic Sea over to Germany and so is in a different part of Europe though all 4 rivers are major rivers in Europe.
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Gr8 Day M8