Waec 2018 Practical and Physical Geography Answers – May/June Expo

1a and 1b)
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1c)
Gradient = Vertical height/horizonal range
=1100-850=250
=12.4cm*50000/100000=6.25km
graient = 250/6250=25/625=1/25
gradient= 25
1d)
i)it is the major drainage of the mapped area
ii)it has a drellis drainage pattern

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7)
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5a)
Drawing
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lunar eclipse occurs when the Moon passes directly behind Earth and into its shadow. This can occur only when the Sun, Earth, and the Moon are aligned, exactly or very closely so, with the planet in between.


5b)
i)A great circle is the shortest path between two points along the surface of a sphere.
ii)great circle is the intersection of the surface with a plane passing through the center of the planet.
iii)They cross successive meridians at different angles.
5c)
i)it use in navigation and aviation.
ii)It Is Use To Know The shortest route between any two places is along the arc of the great circle which passes through them.
iii)It Is Use In Ships crossing the vast oceans and aircrafts follow the Great circle route in order to save fuel and time.

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4ai)
i)caves
ii)sinkholes
iii)skyline landscapes
4aii)
Drawing

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4b)
i)Limestone are all used to neutralise excess acidity of soil in agriculture practice.
ii)Limestone is used as a building material.
iii)It is used in industries to purify iron in blast furnaces.
iv)It used in Glass making.

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8a)
i)Encroachment : More migration lead to less availability of land which lead to higher economic value of land.
ii)Pollution: Explosive increase in the urban population without corresponding expansion of civic facilities such as lack of adequate infrastructure for the disposal of waste results in waste clogging the natural channels and storm water drains.
iii)Illegal mining activities: Illegal mining for building material such as sand and quartzite both on the catchment and on the bed of the lake have extremely damaging impact on the water body.
iv)Interference in drainage system: Drainage congestion caused by badly planned construction of bridges , roads , railway tracts, hampers the flow of water and the result is flood.


8b)
i)Flooding leads to loss of human life
ii)Flooding leads to damage to property
iii)It leads to destruction of crops
8c)
i)Improving Drainage Improving water drainage helps control floods by facilitating easy flow of excess water, especially in urban areas during flash floods.
ii)Building Dikes and Levees Dikes and levees are flood-control structures built to fight river flooding and water surges.
iii)Building Canals; Canals are artificial water channels that can be crucial to flood prevention. Canals facilitate control of water levels passing through, and form linear reservoirs and water locks.
iv)Harvesting Rain Water Harvesting rainwater involves collecting and storing rainwater and can not only prevent floods, it can also curb urban water scarcity.

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COMPLETED

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