How do the contour lines show the direction of the flow of rivers and streams?

Given below are some symbols and conventional signs, name each one:

Draw conventional symbols for the following using appropriate colours where necessary.

(i) Cart-track

(ii) Broken ground

(iii) Nala

(iv) Perennial tank

(v) Stream

(vi) Dry-stream

Draw and compare the following contour diagrams by placing them side by side in pairs:

(a) V-shaped Valley and U-shaped valley

(b) Steep Slope and Gentle Slope

(c) Conical hill and mountain

(d) Ridge and Water Divide