RBSE Class 6 Science Notes Chapter 14 Water

These comprehensive RBSE Class 6 Science Notes Chapter 14 Water will give a brief overview of all the concepts.

RBSE Class 6 Science Chapter 14 Notes Water

→ We use water for various activities in our house like bathing, brushing, drinking, washing clothes, washing utensils, toilets, cleaning floor, etc.

→ Apart from above activities, water is used in agriculture for irrigation. It is used in industries for producing almost everything we see around us.

→ About two-thirds of the Earth is covered with water and most of this water is in oceans and seas. The water in the oceans and seas has many salts dissolved in it, which makes water saline and cannot be used for drinking, domestic, agricultural and industrial purposes.

→ We get water from ponds, rivers, lakes and wells or from underground resources :

• The circulation of water between land and water bodies is called water cycle.
• It means during the daytime, sunlight falls on the water in oceans, rivers, lakes and ponds due to which water gets hot and evaporates continuously in the form of water vapours and becomes a part of air.
• Water also gets evaporated from the fields, roads, rooftops, etc. However, the salts dissolved in the water are left behind.
• Plants use water to prepare their food and the remaining part of this water is released in the air in the form of water vapour through the process of transpiration.
• Hence, we conclude that water vapours enter the air through the processes of evaporation and transpiration.

→ At sufficient height, the air becomes so cool that the water vapour present in it condenses to form tiny drops of water called droplets. It is these tiny droplets that remain floating in air and appear to us as clouds.

→ Some drops of water become so heavy that they begin to fall. These falling water- drops are called rain.

→ Most of the water that falls on the land as rain and snow, sooner or later goes back to the oceans.

→ Heavy rains may lead to rise in the level of water in rivers, lakes and ponds and cause floods.

→ If it does not rain in a region for a year or more than this may lead to drought. In drought conditions, it is difficult to get food and fodder.

→ Only a small fraction of water available on the Earth is sufficient for use of plants, animals and humans. Hence, it is very important that water is used carefully.

→ The basic idea behind rainwater harvesting is, “Catch water where it falls”.