Neco Gce 2017 Expo: Neco Gce 2017 Free Geography Theory/Essay Answers/Runz
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5a.
A landslide is the movement of rock, earth, or debris down a sloped section of land.
5b.
Rivers erode in four ways:
--Abrasion or corrasion - This is when large pieces of bedload material wear away the river banks and bed.
--Attrition - This is when the bed load itself is eroded when sediment particles knock against the bed or each other and break, becoming more rounded and smaller.
--Hydraulic Action - This is when the force of water erodes softer rock.
--Solution or corrosion - This is when acidic water erodes rock.
5c.
1. Slope
- gravity provides the energy to move the materials.
- rapid movements (e.g. landslide, slumping) are commonly found on steep slopes while slow movements (e.g. soil
creep) are found on gentle slopes.
2. Water
- rainwater acts as a lubricant to weathered materials.
- rainwater adds weight to weathered materials.
3. Rock structure
- joints dipping downslope usually assists landslides, rockfalls, rockslide, rock creep..... etc.
4. Vegetation
- lack of vegetation cover to hold the loose particles.
3c.
1 in plains disaster like twister is common without mountains to prevent suchdisasters from happening
2 chances of flood is higher in plains
3 diseases r more in plain areas than any other areas
4 many plants can't grow in plains like coffee
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