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Variety Resources on Earth

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Teacher zaidi@maher2010

CHAPTER 4 : THE
4.1 1. 2. 3. Air 1. 2. 3. 4.

VARIETY OF RESOURCES ON EARTH

THE DIFFERENT RESOURCES ON EARTH Human beings, animals and plants need food, water, air and shelter in order to survive. The Earth has the resources needed to sustain life. The resources are air, water, soil, minerals, fossil fuels and living things.

Air is needed by all living things to survive. The atmosphere is a layer of air that envelops the Earth. Air is a mixture of gases. Air contains gases such as oxygen, nitrogen and carbon dioxide. Oxygen and carbon dioxide are two very important gases that support life on Earth. a. Oxygen i. Used for respiration by living things ii. Used in combustion of materials iii. Used in industries iv. Released during photosynthesis. b. Carbon dioxide i. Used by green plants to carry out photosynthesis ii. Used in fire extinguishers iii. Released during respiration and combustion. Water covers a total of about three quarters of the Earth. The sources of water are oceans, seas, rivers, lakes, rainfall and ground water. Importance of water a. To animals/human i. It provides a medium for chemical process and body metabolism ii. It is the main component of the blood iii. It transports nutrient to all cell in the body iv. It caries excretory products to the kidneys for excretion. v. It helps to control the body temperature. b. To plants i. It helps to maintain the turgidity of plant cells. ii. It is used in photosynthesis. iii. Need for the germination of seeds.

Water 1. 2. 3.

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GOOD LUCK

Teacher zaidi@maher2010

iv. Dissolves minerals slats in the ground for absorbtion by the root of plants v. Helps to support aquatic plants vi. Cool down the plant (transpiration) Soil 1. 2. 3.

4. 5. 6.

Soil refers to the outer layer of the Earth. Soil contains mineral…...

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