1. WELCOME TO CLASS-IX

2. WHAT ARE RESOURCES ? The factors which are needed by human beings for sustenance of life and for luxury are called resources.

3. TYPES OF RESOURCES:- RESOURCES ARE TWO TYPES 1. NATURAL RESOURCES 2. MAN MADE RESOURCES RESOURCES NATURAL MAN MADE

4. WHAT ARE NATURAL RESOURCES? Earth is the only one planet on which life exists. Life on earth is dependent upon many factors such as the land, the water, the air, the living things, ambient temperature, food etc. These life supporting factors which are already available on the earth are called natural resources.

5. BIOTIC AND ABIOTIC RESOURCES BIOTIC RESOURCES:- The living things constitute the biotic resources and ABIOTIC RESOURCES:-The nonliving components such as air, water, land etc constitute the abiotic resources

6. THE BREATH OF LIFE : AIR What is air? Air is a mixture of different types of gases like nitrogen, oxygen, carbon dioxide as well as water vapour etc. Eukaryotic cells and many prokaryotic cells need oxygen for cellular respiration to get energy from the food. Green plants convert carbon dioxide into glucose and provide food to all the biotic community.

7. FUNCTIONS OF ATMOSPHERE IN CLIMATE CONTROL:- The average temperature of earth is fairly steady during the day and also during the whole year but it ranges from -190˙C to 110˙C in the moon. IN THE MOVEMENT OF AIR:WIND:- Uneven heating of the earth’s surfaces(i.e. on land and water) wind is created. RAIN: By evaporation and condensation rain occurs.

8. AIR POLLUTION. Presence of any unwanted gas or particles in the air or increasing of some harmful gases cause air pollution

9. CAUSES OF AIR POLLUTION Combustion of fossil fuels. Smokes from industries. Deforestation. Improper disposal of solid wastes etc.

10. EFFECTS OF AIR POLLUTION Greenhouse effect. Global warming. Acid rain. Respiratory diseases etc.

11. EVALUATION What causes winds? How are clouds formed? List any two causes of air pollution. What are the consequences of air pollution?

12. HOME ASSIGNMENT At your individual level, prepare a poster showing your contribution to reduce air pollution.