Water, the Water Cycle and Conservation: Class 5 Study Guide
Water is essential for life, but only a small fraction of Earth's water is fresh and easy to use.
Water covers most of the Earth, but most of it is salty sea water. Fresh water comes from rivers, lakes, ponds, wells, rainfall and groundwater. In India, monsoon rains are the main source of fresh water, and many people also use borewells, canals and tanks.
The water cycle keeps water moving. The Sun heats water in oceans, rivers and lakes, which turns into water vapour in a process called evaporation. As vapour rises and cools it changes back into tiny droplets, forming clouds (condensation). When the droplets become heavy, they fall as precipitation (rain, hail or snow). The water then flows into rivers and seeps into the ground, and the cycle begins again.
Stages of the water cycle
The Sun heats water; vapour rises.
Vapour cools and forms clouds.
Rain, hail or snow falls.
Water flows to rivers, seas and the ground.
Sources and uses of water
People use water for drinking, cooking, bathing, washing, farming and industry. Most of the water used in India goes to farming. Water must be safe before we drink it. It can be made safer by boiling, filtering or using a water purifier. Waterborne diseases spread when drinking water is dirty.
| Source | Example | Notes |
|---|---|---|
| Surface water | rivers, lakes, ponds | can dry up in summer |
| Groundwater | wells, borewells | refilled slowly by rain |
| Rainwater | harvested in tanks | can be stored |
| Sea water | oceans | salty; not for drinking |
Saving water
Many places face water shortages. Simple actions help: turn off taps while brushing, fix leaks, use a bucket instead of a shower, reuse water from washing vegetables for plants, and avoid wasting water at school. Rainwater harvesting collects rain from roofs and stores it in tanks or sends it underground to refill groundwater. Never throw rubbish into rivers and lakes.
Worked example and common mistakes
Example: A dripping tap loses a few drops each second. Over a day these add up to many litres, which is why repairs matter. Common mistakes: thinking that water is used up (it keeps cycling), confusing evaporation with condensation, and forgetting that clean water is limited. Label a diagram of the cycle to remember it.
Check your understanding: model answers
1. Water vapour cooling and turning into tiny droplets, forming clouds. 2. For example, rivers and wells. 3. For example, fix leaks and close taps while brushing teeth.
✨ Key Takeaways
- The water cycle: evaporation, condensation, precipitation, collection.
- Most water on Earth is salty.
- Boil or filter water to make it safer.
- Save water and harvest rain.
💬 Questions for Discussion & Reflection
- What is condensation?
- Name two sources of fresh water.
- Give two ways to save water at home.
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