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Difficulty: EasyEnvironmental Hazards, Degradation, and Management

In Southeastern Nigeria, intense rainfall on fragile soils often leads to severe slope degradation and gully erosion. Which of the following statements correctly distinguishes between the initial weathering of rocks on these slopes and the mass wasting process that follows?

  1. Weathering is the in-situ disintegration of rock materials without transport, whereas mass wasting is the downslope movement of rock and soil debris under the influence of gravity.Answer
  2. B
    Mass wasting involves the in-situ chemical breakdown of rock surfaces, whereas weathering refers exclusively to large-scale soil movement carried by running water.
  3. C
    Weathering requires the active transportation of surface soil by wind or water, whereas mass wasting occurs entirely without any gravitational movement.
  4. D
    Weathering and mass wasting describe identical physical processes, but mass wasting takes place exclusively in coastal environments.

Answer

Weathering is the in-situ disintegration of rock materials without transport, whereas mass wasting is the downslope movement of rock and soil debris under the influence of gravity.
Weathering involves the weakening and disintegration of rocks in place (in-situ) without moving them. Once rocks and soil are loosened, mass wasting takes place as gravity pulls the unattached earth materials down slopes, contributing to severe landscape degradation such as gullies in region like Southeastern Nigeria.

Step-by-Step Solution

1
Define weathering in physical geography
Identify that weathering refers to the static, in-situ (in place) breakdown or alteration of rocks and minerals by physical, chemical, or biological agents without significant transport.
Establishing the static nature of weathering isolates it from transport processes.
2
Define mass wasting in the context of slope degradation
Identify that mass wasting involves the bulk downward movement of soil, regolith, and rock debris under the direct force of gravity.
Gravity is the primary driving mechanism of mass wasting.
3
Compare the definitions to evaluate slope degradation mechanisms in Southeastern Nigeria
Distinguish between static rock breakdown (weathering) and gravity-driven movement down slopes (mass wasting).
This clear distinction directly addresses the core geography concept tested.

Key Concept

Distinction between Weathering and Mass Wasting
Estimated Time:45s
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Topics

Environmental Hazards, Degradation, and Management

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