Grade 9

Acid Rain

Water droplets in the atmosphere react with carbon dioxide gas to form an acid called carbonic acid. Water is normally ...
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Characteristics of water

Water is the most common substance on the planet yet it has some very unsual characteristics. Pure water is odourless ...
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Desalination

Changing salty water to fresh water. Called the 'blue planet' or the 'water planet' the Earth's surface is 70% covered ...
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Hydro-Electricity

Generating electricity using water Most of South Africa’s electricity is generated by burning coal. This heats water which creates steam ...
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Rusting

Rusting occurs when iron reacts with oxygen in the presence of water. This is a form of corrosion that results ...
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Solar Water Heater

In most homes the geyser is the appliance that uses the most electricity.  Geysers use electricity all day to keep ...
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Virtual Water

We all know how important it is to turn off the tap while we are brushing our teeth and that ...
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Water in the Body

We can describe the Earth as a watery planet because 70% of it's surface is covered in water.  All living ...
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Water Molecules

Water is a compound composed of two elements, Hydrogen and Oxygen.  Each water molecule consists of two Hydrogen atoms joined ...
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