• The two most important things without which we won't be able to live are air and water.
• The air is all around us in our environment, and we take it in when we breathe.
Figure 1: Use of water in various ways
• This air consists primarily of oxygen and nitrogen in addition to small amounts of other gases, bacteria, and viruses.
• Water is important to us in many ways.
• It is used for:
1. Bathing, 2. Drinking, 3. Washing, 4. Cleaning, 5. Cooking, 6. Watering plants