As lines of longitude approach the poles, the between the lines decreases

Distance

Explanation:

Longitudes are the lines that move from the extreme north pole to the south pole and are perpendicular to the latitudes. The distance between these lines is maximum at the equator and minimum at the poles as the earth is flattened at the poles.

At the equator (0°), 1° of longitude corresponds to approximately 69 miles and as it reaches the poles, these value reduces to less than 30 miles.

Thus, the lines of longitude converge at both the poles, and so the distance between these lines is the least.

seismic wave -

an elastic wave in the earth produced by an earthquake or other means.

explanation: