The upward wind or wind in general
Soil, water and air pollution in eastern Europe.
Answer:
C
Explanation:
Roads can vary in elevation, since a road is essentially any path to walk on.
Hills have varying elevations - they are higher at certain points.
Rivers can flow downhill and aren't always at equal elevation.
Contour lines on a topographical map connect points of equal elevation. If you were to follow a contour line while walking, the elevation would remain constant.
