In the diagram, above, marker d is pointing to a which is a landform that forms when a river slows down as it flows into an ocean or lake. as the river slows, it drops its sediment load, gradually creating a network of small channels and islands.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

i think its 100

i hope this !