Waec 2018 Geography Practical and Physical Geography) 3 Answers, Geography Practical Questions, WASSCE 2018 Physical Geography Answers May/June Free Expo, Waec 2018 Geography Answers
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(1a and 1b)
YOU HAVE TO VIEW THIS NUMBER WITH A BROWSER:
Gradient = vertical height/horizontal height.
= 1100 – 850/12.4×50,000
(i) It is the major drainage of the mapped area.
(ii) It has a trellis drainage pattern.
-If well constructed it shows distribution and comparative densities
-It is easier to show variation in distribution of wide variety of commodities if it is presented using different colours.
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.
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.
i)Great circle are of importance to navigation and aviation.
ii)The shortest route between any two places is along the arc of the great circle which passes through them.
iii)Ships crossing the vast oceans and aircrafts follow the Great circle route in order to save fuel and time.
7a) [img] https://expoweb.com.ng/wp-content/uploads/2018/04/IMG-20180420-WA0142.jpg[/img]
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.
– Flooding leads to loss of human life
– Flooding leads to damage to property
– It leads to destruction of crops
(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