NCERT Class 6 Science Chapter 14: Water YouTube Lecture Handouts

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NCERT Class 6 Science Chapter 14: Water

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Imagine There is Only Handful Water – 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

  • 2/3rd earth covered with water – oceans and seas

  • Saline water – not fit for drinking (water - water everywhere, nor a drop to drink)

  • Ocean supply us water (indirectly) Water Cycle

  • Circulation of water and land – continuous process and maintains supply of water on land

  • 👉 Disappearing Trick of Water (cloths dry, wet floor dries) where does this water goes?

  • Water evaporates

  • Salts are left behind

  • 👉 2 plates – 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 – loss of water from plants

  • 👉 Ice in Glass (water droplets on surface) – Condensation

  • Condensation brings water back to surface

  • As we go high it cools and water vapor condenses to form droplets – cloud formation

  • Precipitation – rain, snow, hail, ….

  • 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 – source for lakes, handpumps and tubewells

  • Flowing water causes soil erosion (seepage occurs but if concrete then no seepage)

Rains Heavily

  • In India – 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 – 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 – collection of water for dry months

  • “Catch water where it falls”

  • Rooftop

  • Allow it to percolate directly to ground

  • Tanks

  • Reservoirs

  • Water is also used as means of transport

  • Many civilizations flourished near water – Harappan, Egyptian

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