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Patterns and processes of evolution. How evolution and natural selection are reflected in the similarities and differences of organisms. 

This online resource discusses the distribution of earth's water.

This YouTube video will guide you through a fun activity where you will draw the earth's continents and oceans.

Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem.

This YouTube video explains how river basins are formed.

This online resource discusses the importance of the ocean, the layers and composition of the ocean and how it moderates climates.

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

This online resource investigates the features and topology of the ocean floor, the effects of wave erosion and the landforms created by coastal depositions.

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.