Explanation

(a) Waterfall: occurs at the upper course of a river, occurs as a result of erosion, a resistant hard rock is left to form an obstacle, the protruding obstacle now causes the river to rumble down from a higher to lower ground, may be formed when a river plunges down the edge of a plateau, when a fault-line scarp lies across a river.

(b) Delta:

• A feature of the lower course of a river/or at the mouth of a river.
• Formed as a result of deposition of sediments at the lower course of a river.
• Rate of deposition faster than rate of removal of silt at the coast slow rate of flow of the river.
• Here the river divides into several channels called distributaries shallow depth of water along the coast.
• The distributaries cut through the deposits before finally flowing into the sea

(c) Inselbergs: are isolated mountains formed as a result of intrusion of magma into the earth's crust and resisted erosion when all other surroundings were eroded, exposed by differential erosions by water or wind. 
 

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