SS3 First Term Geography Lesson Note – Karst Topography

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WEEK: 5 and 6           

TOPIC: KARTS TOPOGRAPHY

CONTENT:

1. KARST TOPOGRAPHY OR LIMESTONE REGION
2. CHARACTERISTICS OF KARST TOPOGRAPHY
3. FEATURES OF KARST REGION

SUB-TOPIC 1: KARST TOPOGRAPHY OR LIMESTONE REGION

MEANING: Limestone region refers to a large stretch of land occupied by limestone which possesses a unique type of topography. Limestone is a sedimentary rock of organic materials made up of calcium carbonate. They are derived from accumulation of corals and shell in the sea. When magnesium is present it is termed DOLOMITE. Chalk is a very pure form of limestone, white and rather soft.

EVALUATION

1. Explain the word karsts topography

SUB-TOPIC 2: CHARACTERISTICS OF KARST TOPOGRAPHY

1. SOLUBILITY: Limestone is in soluble but is made soluble by the action of rain water which dissolves carbon dioxide to form a weak acid which in turn acts upon it (limestone) to make it soluble.
2. ABSENCE OF LUXURIANT VEGETATION COVER: There is complete absence of thick vegetation cover in limestone region.
3. ABSENCE OF SURFACE DRAINAGE: Most surface water flow for a short distance and disappears underground due to easy permeability of the region
4. JOINTS AND RUGGED TOPOGRAPHY: Limestone regions are well jointed, and stony with broken landscape
5. DRY SURFACE: Due to easy penetration of water in limestone regions, all valleys are usually dry. Water on meeting hard rock underground may re-emerge below the limestone as spring or
6. PRESENCE OF DEPRESSION: Limestone regions contain depression of varying sizes and depth.

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