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Geography (Practical and Physical) Waec GCE 2016 Free Expo Answers


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Thursday,15th September, 2016
Geography (Practical and Physical
Geography) 2.00pm – 3.50pm
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GEOGRAPHY PRACTICAL ANSWERS



1a)
Map scale = 1:50:000
Map distance =20.5cm
Ground distance =20.5/1 * 50,000/10,000 * 50,000/100,000
20.5/1 * 1/4 =5.125km

1c
- farming due to presence of scattered grass
- fishing due to presence of rivers
-Transportation due to presence of roads network
-Trading due to presence of market

1d)
– The map area is well drained by river Owan
– The settlement avoid hilling area of the mapped area
– Road network are also seen to avoid the mountain area
– River valley are located on the hilling side of the mapped area
– Deltain area are located at the southern part of the mapped area




3a)
Temperature is the degree of hotness or coldness of a body or an object.It is measured with thermometer

3b)
As height or altitudes increases,temperature decreases.hence for every 100metres of ascent,temperature decreases by 0.65 degrees celcius or 1 degrees celcius for approximately 160metres of ascent.The decrease in temperature with increasing elevation is called lapse rate

3c)
Town A:
Temp=50C
Height=sea level
Town B:
Temp=?
Height=4000m above sea level
Recall 1C=160m
Tb=4000m
(Tb*160)/160=(4000*1)/160
Tb=25C
Therefore the temperature of town B is 25 degrees celcius


4a)
Weathering is the process of weakening and breaking up rocks. It is the physical and chemical breakdown of rocks and minerals at or near earth's surface.

4b)
- Carbonation
- Oxidation
- Hydrolysis

4c) -Frost action in mechanical weathering is a type of mechanical weathering where we see the breakdown of rock due to the expansion of ice.

-Exfoliation in mechanical weathering is the process in which rocks weather by peeling off in sheets rather than eroding grain by grain.
Exfoliation can wapbaze.com happen in thin layers on individual boulders, or it can take place in thick slabs
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7a)
-Flood
-Earth quake
-Volcanic Eruptions

7b)
- Air pollution cause Acidification:
Chemical reactions involving air pollutants can create acidic compounds which can cause harm to vegetation and buildings.
- Air pollucation causes Eutrophication:
Rain can carry and deposit the Nitrogen in some pollutants on rivers and wapbaze.com soils. This will adversely affect the nutrients in the soil and water bodies. This can result in algae growth in lakes and water bodies, and make conditions for other living organism harmful.
- Ground-level ozone:
Chemical wapbaze.com reactions involving air pollutants create a poisonous gas ozone (O3). Gas Ozone can affect people’s health and can damage vegetation types and some animal life too.

7c)-Tall chimneys should be installed in factories.
-Better designed equipment and smokeless fuels should be used in homes and industries.
-Renewable and non- polluting sources of energy like solar energy,wind energy,etc,should be used.
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5a)
1-water falls
2-Gorges
3-V.shape valley
4-Vertical erosion

5b)
Oxbowlake:It is usually at the lower course of a river due to the deposition of sediments carried by the river.It is a cresent shaped lakes formed by the running water through a meadow reek.As the river wideans it becomes more noticeable,the reek between two bend of the meadow become reduced



6ai)Abrasion is the sand blasting action of loose particles which are driven against exposed rock surfaces, scratching such surfaces and wearing them off

6aii)Attrition is the process whereby the rock particles in motion are worn and reduced in size by their constant collision with one another as well as with obstacles on their way and with the river bed itself




8a)
OROGRAPHIC RAINFALL Diagram FORMATION
It is formed when ascending air mass meet a barrier. The air masses are forced to rise leading to rainfall in the windward slope.


8b)
i)It leads to formation of rain fall
ii)It brings about cool and mild weather
iii)It reduces amount of sokar radiation but scattering harmful ray.
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8b)
i It leads to formation of rainfall
ii It brings about cool or mild weather
iii It reduces amount of solar radiation by scattering harmful rays




9a
Draw map of Africa



9ai
-locate river nile and
zambezi

9aii
-the aswan high dam and
kariba dam

9b
-they provide employment
oppotunities -they provide
oceanic food
-they aid movement of
people from one place to
another

9c
-they are limited due to
their seasonal nature
-they are characterise due
to their highg dendritics
tricks
-they are swallow in
nature







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