Thirukkural says that without water there would be no life on the earth. Water resources are getting depleted because of growing demand and lifestyle changes, and supply is reduced by pollution and climate change. Next to air, water is the most important resource for our survival, so every individual is responsible for saving water.
1. Composition and Occurrence of Water
- Three fourths of our planet earth is filled with water.
- Water exists in three states: solid, liquid and gas.
- Our body is made up of water (65%), but it is not apparent.
- Water is a chemically stable compound. Its chemical name is dihydrogen monoxide (H2O); its constituent elements are hydrogen and oxygen.
| Where water on the earth's surface is found | Share |
|---|---|
| Oceans | 97.25% |
| Polar ice caps and glaciers | 2.05% |
| Lakes, rivers and aquifers (ground water) | The remaining part |