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This video explores what recurring decimals are and how to write them as fractions.

This is a document from Fuseschool- global education which simplifies the study of recurring decimals in a simple step.

This YouTube video describes  what recurring decimals are, and how to write them as fractions.

This YouTube video explains how river basins are formed.

Even though molecules, proteins, viruses, and cells are all tiny, there are significant size differences between them. The diameter of a water molecule is roughly 0.28 nanometers. The diameter of the protein hemoglobin is roughly 5 nanometers. The diameter of the HIV virus is roughly 120 nanometers. A red blood cell is 6-8 micrometers.

This is an online activity providing you with exercises in sorting decimals from least to greatest.

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

Defining and comparing tension, weight, friction and normal forces using free body diagrams.

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.