The Green House Effect : Some of the infrared radiation from the earth passes through the atmosphere but most is absorbed and re-emitted in all directions by greenhouse gas molecules and clouds. This warms up the Earth’s surface and the lower atmosphere
- Water pollution is the contamination of water by substances harmful to life.
- Sewage, agricultural chemicals and industrial waste are some of the major contaminants of water.
- Water which is purified and fit for drinking is known as potable water.
- Water is a precious natural resource. We must learn to conserve it.