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This YouTube documentary highlights the ecological and socio-economic importance of the Tana River Basin in Kenya.

This online tutorial will provide you with some guidelines on how to interpret both topographic and geologic maps.

This 32 minute long YouTube video investigates the water contamination problems in Tanzania, with specific focus on Dar Es Salaam. 

This 11 minute long YouTube video describes the various causes and types of water pollutants.

Energy is a quantitative property of a system that depends on the motion and interactions of matter and radiation within that system. That there is a single quantity called energy is due to the fact that a system’s total energy is conserved, even as, within the system, energy is continually transferred from one object to another and between its various possible forms.

This YouTube video investigates what water pollution is and some examples and effects of water pollution.

In this lesson you will learn about:

• the concept of work
• understand that work is done by an applied force
• the concept of energy
• identify the different types of energy
• the concept of power