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Difficulty: MediumSoil Formation, Profiles, and Major Vegetation Types

Arrange the following major West African vegetation biomes in sequence from the southern Atlantic coast moving northward toward the Sahara Desert border:

  1. 1Mangrove Swamp Forest
  2. 2Tropical Rainforest
  3. 3Guinea Savanna
  4. 4Sahel Savanna

Answer

The correct order from south to north is Mangrove Swamp Forest, Tropical Rainforest, Guinea Savanna, and Sahel Savanna.
Moving from the Atlantic coast in the south northward to the Sahara Desert, rainfall progressively decreases and dry seasons lengthen. This creates a distinct latitudinal zonation starting with coastal Mangrove Swamps, followed by dense Tropical Rainforest, then sub-humid Guinea Savanna, and finally semi-arid Sahel Savanna along the desert fringe.

Step-by-Step Solution

1
Identify the coastal saline start point
Mangrove Swamp Forest is situated at the shoreline.
Salt-tolerant mangroves require permanent coastal inundation and tidal brackish conditions.
2
Locate the wet equatorial high forest belt
Tropical Rainforest develops immediately inland behind the mangrove belt.
Abundant annual precipitation exceeding 2000 mm sustains dense evergreen and semi-deciduous rainforest trees.
3
Identify the sub-humid grassland transition
Guinea Savanna follows north of the rainforest zone.
A moderate dry season limits tree growth and encourages tall grasses with scattered fire-resistant trees.
4
Locate the semi-arid northern boundary
Sahel Savanna forms the northernmost vegetation belt before entering full desert.
Low annual rainfall under 500 mm supports sparse tufted grasses and drought-adapted thorny acacias.

Key Concept

Latitudinal Zonation of Vegetation Biomes
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Topics

Soil Formation, Profiles, and Major Vegetation Types

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