Appearance: Delta is a feature of lower course of rivers with many distributaries: It is actuate, bird foot or fan-shaped and low lying at the mouth of rivers. Examples are Niger delta, I Main Stream Nile, Mississippi.
Formation: Presence of tideless coast or (River Niger) sheltered coast, sluggish river with heavy deposition of silt at the mouth and availability of lowland areas towards the mouth Tributaries of a river.
Uses: Good agricultural land especially for cultivation' of rice, oil palms and raffia palms. It is also good for fishing and petroleum mining
Appearance: Two parallel consequent rivers with tributaries separated by a river more powerful and with presence of wind gap. Examples are River irrawady in India, River Ogunpa (Ibadan), in Nigeria.
Formation: One river erodes more aggressively than the other; the more powerful river makes greater rate of headward erosion. The more powerful river cuts through river divide then captures water of weaker stream. The lower part of the pirated stream now forms what is called misfit, the point of capture is termed elbow of capture and a wind gap is formed.
Uses: Rich in agricultural land with the vegetation always available for cattle. The wind gap serves as communication route.
Appearance: Feature of upper course of river,with steep slope which forms plunge pool. Examples are Kwa fall, Victoria fall, Niagara fall, Erin-ljesa fall, etc
Formation: Resistant rock forms a bar across a river valley, fault line scarp lies across a river course, water plunges down the plateau edge, this may develop to form rapids. Undercutting softer rocks and water fall recedes upstream.
(iv) Inselberg - Appearance: Is found in semi and / arid land form in isolated rocky out crops/composed of granite or gneiss, steep sided/may occur singly or in group round/flat topped-dome shaped. Polished surface/may rise up to over 500 metres with screes found at the base. Examples are Tibesti Plateau, ldanre Hill, Senna hill, Olumo hill, Ahaggar plateau, all in Northern Nigeria and Kalahari desert. Western Australia.
Formation: Formed in semi arid regions, mechanical weathering is dominant and extensive in old plateau(s). Weathering and removal of weathered materials by water and wind with the hard outcrops now exposed.
Uses: Tourism and quarrying
