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Difficulty: MediumEnvironmental Hazards, Degradation, and Management

Match each environmental hazard or degradation type in West Africa with its primary contributing cause and regional manifestation.

  • Gully ErosionIntense torrential rainfall acting on fragile, poorly consolidated sedimentary soils along steep relief in Southeastern Nigeria.
  • Oil SpillagePipeline vandalism, equipment failure, and improper waste discharge in delicate mangrove ecosystems of the Niger Delta.
  • DesertificationProlonged droughts, overgrazing, and excessive fuelwood cutting causing southward expansion of arid land across the Sahel belt.
  • Coastal ErosionStrong ocean wave action, tidal surges, and beach sand mining eroding low-lying sandy shorelines along the Atlantic coast.

Answer

Gully Erosion pairs with intense rainfall on fragile soils in Southeastern Nigeria; Oil Spillage pairs with pipeline leaks in the Niger Delta mangroves; Desertification pairs with overgrazing and drought in the Sahel belt; Coastal Erosion pairs with ocean wave action along the Atlantic coastline.
Each hazard is accurately matched to its specific geographical setting and primary physical or human drivers: Gully Erosion with Southeastern rain-induced soil scouring, Oil Spillage with Niger Delta petroleum activities, Desertification with Sahelian dryland vegetation loss, and Coastal Erosion with Atlantic marine wave action.

Step-by-Step Solution

1
Analyze the landform process and physical triggers for Gully Erosion.
Identify Southeastern Nigeria (e.g., Anambra, Imo) as the major regional hotspot driven by heavy rainfall and friable soils.
Geological composition and high precipitation make steep slopes vulnerable to deep channel scouring.
2
Analyze anthropogenic industrial hazards in coastal riverine zones.
Match Oil Spillage to petroleum extraction activities in the Niger Delta mangroves.
Pollution in wetlands is directly tied to crude oil extraction and transport infrastructure.
3
Examine dryland degradation mechanisms in semi-arid zones.
Match Desertification to drought, overgrazing, and deforestation in the Northern Sahelian zone.
Vegetation removal exposes dry soils to wind erosion and desert encroachment.
4
Identify coastal dynamic processes.
Match Coastal Erosion to wave impact and beach sand mining along Atlantic coastal areas like Lagos.
High-energy oceanic wave mechanics actively scour low-lying barrier beaches.

Key Concept

Regional distribution and cause-and-effect relationships of major environmental hazards in Nigeria
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Topics

Environmental Hazards, Degradation, and Management

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