2016 Waec gce Geography 3 (physical and practical geography) Expo

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





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


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 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 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.


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 happen in thin layers on individual boulders, or it can take place in thick slabs


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