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There are some key words that you need to know for circles: radius, circumference, diameter, sector, segment, tangent, chord and arc. In this video you will discover what they all mean.

This video discusses the topic of circles.

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

This video explains the equation of a circle.

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

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.