Sources of Electricity

Dry cells

Accumulators

Dynamos

Satellites get their electricity from solar cells.

Hydroelectric power station

Water Resources

Water is important to all living things. There are several uses of water at home such as:

                                                                     washing

                                                                             drinking

                                                                             bathing    

Water is also used as raw material in the food industries.

Water is home to many living things.

Water is needed to carry out many life processes such as transporting minerals in plants. Water is used by plants to make food.

Phases of the Moon

From the earth, the Moon looks like it is changing its shape. Actually it does not. It is caused by the different positions of the Moon that we see from the Earth. This is called the phases of the Moon. There are four major phases of the Moon. There are four major phases of the Moon

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Renewable or Non-renewable?

The energy we use every day comes from various resources. These resources are divided into renewable and non-renewable energy.

Renewable energy

Solar

Wind

Biomass

Water

Non-renewable energy
Natural gas

Nuclear reactor

Petroluem

Coal

Yeast is used to help dough to rise in making bread.

Bacteria and fungi cause dead organisms to decay to form natural fertilizers.

Fungi are used to produce antibiotics.





Here some harmful effects of microorganisms.

Eating food contaminated with microorganisms can cause food poisoning.

Bacteria act on the food remains between the teeth. This produces acid which causes tooth decay.

Food turns bad because of bacteria and fungi.