NCERT Class 6 Science Chapter 14: Water YouTube Lecture Handouts
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NCERT Class 6 Science Chapter 14: Water
Imagine There is Only Handful Water β What Will Happen?
Drinking
Brushing
Bathing
Washing
Cleaning
For daily activities, for industries, for irrigation
Water from tap is drawn from lake, river or well and supplied through network of pipes
2β3rd earth covered with water β oceans and seas
Saline water β not fit for drinking (water - water everywhere, nor a drop to drink)
Ocean supply us water (indirectly) Water Cycle
Circulation of water and land β continuous process and maintains supply of water on land
π Disappearing Trick of Water (cloths dry, wet floor dries) where does this water goes?
Water evaporates
Salts are left behind
π 2 plates β one in sun and other in shade (water disappears faster in sun)
This warm air provides heat for evaporation of water in the shade.
Evaporation is a slow process
Transpiration β loss of water from plants
π Ice in Glass (water droplets on surface) β Condensation
Condensation brings water back to surface
As we go high it cools and water vapor condenses to form droplets β cloud formation
Precipitation β rain, snow, hail, β¦
Back to Oceans
Snow melts and merges into rivers
Rivers cover long distance and fall in sea
Rainwater absorbs in soil and disappears
Water as ground water β source for lakes, handpumps and tubewells
Flowing water causes soil erosion (seepage occurs but if concrete then no seepage)
Rains Heavily
- In India β most rain in Monsoons after hot summer seasons
- Rise in water level in water bodies
- Submergence of land
- Damage by floods
- Damage to crops, animals, property and life
- Animals are trapped on land areas and die when flood recedes
- Water is blocked in pits and drains β cause diseases
Lack of Rain
- Become dry
- Water bodies will not have ample water
- Loss of agriculture and crops
- Difficulty in food and may lead to famine
- Underground water level falls
Conserve Water
- Small fraction of water is fit for drinking
- Wise use of water is must
- Judicious use
- Stop wastage
- Do not pollute water bodies
- Rainwater harvesting β collection of water for dry months
- βCatch water where it fallsβ
- Rooftop
- Allow it to percolate directly to ground
- Tanks
- Reservoirs
- Water is also used as means of transport
- Many civilizations flourished near water β Harappan, Egyptian
β Mayank