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Question

Difficulty: MediumEnvironmental Hazards and Degradation

Match each environmental hazard occurring in Nigerian regions with its primary anthropogenic driving factor.

  • Urban flash flooding in coastal LagosBlockage of natural drainage channels by improper waste disposal and illegal structures
  • Accelerated gully incision in Anambra StateVegetation clearing combined with road construction lacking proper drainage outlets
  • Marine and aquatic ecosystem degradation in the Niger DeltaCrude oil spillage and untreated effluent discharge into coastal waters and creeks
  • Severe agricultural topsoil sheet erosion in savanna farmlandsIntensive tillage, overgrazing, and continuous removal of protective ground cover

Answer

Urban flash flooding in Lagos matches with drainage blockage by waste and structures; Accelerated gully incision in Anambra matches with vegetation clearing and improper road drainage outlets; Marine ecosystem degradation in the Niger Delta matches with crude oil spillage and effluent discharge; Agricultural topsoil erosion matches with intensive tillage, overgrazing, and removal of ground cover.
Each hazard correctly aligns with its characteristic regional trigger in Nigeria: Lagos flooding is driven by blocked drainage; Anambra gully formation is driven by land clearing and unchanneled road runoff; Niger Delta aquatic damage is caused by oil spills and effluents; and savanna soil degradation is caused by overgrazing and intensive soil tillage.

Step-by-Step Solution

1
Identify the main human triggers of urban flash flooding in coastal mega-cities like Lagos.
High-density urbanization combined with improper waste disposal clogs drainage channels, causing water retention during rainstorm events.
Inadequate municipal drainage infrastructure causes rapid surface water pooling.
2
Examine the specific engineering and land-use factors driving gully erosion in southeastern Nigeria.
Unplanned road gutters direct concentrated runoff onto fragile, easily eroded soil strata in states such as Anambra.
Concentrated high-velocity runoff cuts rapidly into unprotected subsoils.
3
Analyze the primary causes of water pollution and aquatic loss in petroleum-producing areas.
Oil spills from hydrocarbon extraction and industrial discharges pollute creeks, killing aquatic life and damaging wetlands.
Chemical and oil contamination directly destroys marine biological life.
4
Relate farming practices to soil degradation in open savanna environments.
Overgrazing and clearing vegetative residue leave exposed surface soil vulnerable to raindrop impact and sheet wash.
Ground cover removal exposes topsoil to severe kinetic erosion by rainfall.

Key Concept

Human activities as driving forces of regional environmental hazards
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Topics

Environmental Hazards and Degradation

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