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(i) State four main reasons why lakes within the Rift valley are salty
(ii) Name any three fresh water lakes in Kenya which are within the rift valley
(iii) Explain any four economic significance of lakes to Human

Answer Text:
i) -Some lakes lacks outlets
-Bedrock over which lake water is in contact may contain mineral salts.
-Surface run-off and rivers may dissolve a lot of salt from rocks on which they flow
-Excessive evaporation in areas where temperatures are high.
ii) – L. Naivasha
-L. Turkana
iii) -Some lakes provide water for both domestic and industrial use.
-Some lakes forms tourist attraction sites and thus earning the country foreign exchange.
-Some lakes provide building materials e g sand
-Some lakes provide water for irrigation hence enhancing agriculture.
-Some lakes provide transport routes.
-Some lakes are sources of minerals e g L. Magadi.
-Some lakes are sources of fish (food) which is a source of protein for man.