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Zorluk: OrtaRelief, Physical Regions, and Drainage Systems of Nigeria

A hydrologist analyzing satellite imagery of Nigeria observes a drainage network where short tributary streams flow down parallel ridges and join the main stream almost at right angles, controlled by alternating bands of hard and soft folded sedimentary rocks. In which of the following physical regions of Nigeria is this trellis drainage pattern most prominently developed?

  1. The folded sedimentary belt of the Benue TroughCevap
  2. B
    The upper crystalline basement complex of the Jos Plateau
  3. C
    The low-lying coastal floodplains of the Niger Delta
  4. D
    The flat alluvial plains of the Sokoto-Rima basin

Cevap

The folded sedimentary belt of the Benue Trough
The correct option is the folded sedimentary belt of the Benue Trough. Trellis drainage patterns form in regions with folded sedimentary topography where softer strata weather into parallel valleys while resistant strata form ridges. Tributaries cut through weak rock belts and join the master stream at right angles along fault lines and fold axes, which is characteristic of the Benue valley sedimentary structure.

Adım Adım Çözüm

1
Identify the key structural and landform characteristics described in the stem.
The network displays tributaries joining main rivers at right angles along parallel ridges of folded sedimentary rock (trellis pattern).
Trellis drainage develops specifically in areas where geology exhibits folded or faulted parallel rock strata of varying resistance.
2
Evaluate the relief and geological structure of Nigeria's physical regions.
The Benue Trough is a major Cretaceous rift basin with folded sedimentary structures, creating lineaments and parallel ridges conducive to trellis drainage.
Crystalline plateaus develop radial drainage, deltaic lowlands develop distributary networks, and uniform flat plains develop dendritic patterns.
3
Match the specific drainage pattern to the corresponding physical region.
The folded sedimentary belt of the Benue Trough is the correct physical region.
Structural control from fold axes in the Benue valley directly produces the right-angled tributary alignments characteristic of trellis drainage.

Anahtar Kavram

Structural control of drainage patterns in Nigerian physical regions
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Konular

Relief, Physical Regions, and Drainage Systems of Nigeria

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