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| Introduction |
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| The word 'resource' means supplying a material generally held in reserve. The common natural resources include energy, air, water, land, minerals, microorganisms plants and animals. |
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| For man, the resources are the substances required for his survival and comforts. These substances are obtained directly from the environment. The nature of the resources varies from society to society. The variation is related to the culture, level of development, nature of work of a society. |
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| A balance exists in nature in the relationship between organisms and their physical environment. Man has disturbed this natural balance by excessive use of natural resources. This has caused ecological crises and has threatened his very existence. |
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