RBSE Class 7 Science Notes Chapter 16 Water: A Precious Resource

These comprehensive RBSE Class 7 Science Notes Chapter 16 Water: A Precious Resource will give a brief overview of all the concepts.

RBSE Class 7 Science Chapter 16 Notes Water: A Precious Resource

→ Water is essential for all living beings. There can be no life without it.

→ March 22 is celebrated as the World Water Day.

→ The amount of water recommended-by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 litre per person per day.

→ Year 2003 was observed as the International Year of Fresh Water to make people aware of this dwindling natural resource.

→ 71% of earth’s surface is covered with water. However, most of this water is not fit for human consumption directly.

→ The water that is fit for use is freshwater.

→ Water exists in three forms : solid, liquid and vapour.

→ The constant circulation of water between its 3 forms is called the water cycle. This keeps the total amount of water on the earth constant even when the whole world is using it.

→ The water found below the water table is called groundwater.

→ Water drawn from under the ground gets restored by seepage of rain water. The water table does not get affected as it is replenished by natural processes.

→ Rapid growth of industries, increasing population, growing irrigation requirements and mismanagement are some of the causes for water shortage.

→ The distribution of water over the globe is quite uneven, some regions in our country may have floods while others may suffer from drought at the same time.

→ We need to be worried about the wastage during the supply of water through pipes, the leaking taps in buildings and other places.

→ Bawri is a large well - like structure which is the traditional way of collecting rainwater.