Give three processes that lead to formation of lakes

KCSE Geography Paper 1 2007 Section B Question 9.

​(a) Give three processes that lead to formation of lakes 

• Down warping/ tilting
• Tectonic movements
• Man- made lakes
• Lava dammed lakes
• Glacial erosion lakes
• Maraine dammed lakes

​(b) (i) Describe how lake Victoria was formed 

• Formed when the earths surface downwarped and tilted forming a hollow depression that was fitted with water.
•  Earth movements led to crustal down warping.
• A shallow depression was created.
•  The areas around the depression underwent uplifting.
•  The uplifting reversed the direction of rivers such as R. Kagera.
•  Water from the rivers and from rain eventually filled the depression.
•  The resulting feature became a lake. 

(ii) Explain how lake Victoria influences the climate of the surrounding areas 

• Heavy rainfall due to moisture from the lake
• High temperature due to low altitude caused by the depression
• Availability of water has attracted the industrial set up that pollute the environment

​(c) (i) Apart from Lake Magadi name two other lakes within the rift valley in Kenya that have a high level of salinity 

• L. Natron
• L. Bogoria
• L. Elementaita

​(ii) Explain three causes of salinity in Lake Magadi 

• Lack of underground outlet
• Acidic volcanic rock layer on the lake bed
• Lack of surface outlet
• River  entering the lake flowing on acidic rocks

​(d) Give four economic uses of lakes other than mining 

• Source of fish
• Irrigation
• H.E.P production
• Source of river
• Tourists attraction

​Related Geography Searches on external land forms, Lakes Form 3 Level

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