Science · Class 6
Water
Sources of water, water cycle, and water conservation.
4 sections15–25 min read6 MCQs · 2 examples
Chapter Overview
Water is essential for life. This chapter covers sources of water, water cycle, evaporation and condensation, cloud formation, and conservation of water.
Sources and Forms
- Sources: rivers, lakes, ponds, wells, rain, oceans
- 97% of Earth's water is salty ocean water
- Only about 3% is freshwater; much is frozen in glaciers
Water Cycle
- Evaporation: water → vapour (Sun's heat)
- Condensation: vapour → droplets (clouds)
- Precipitation: rain, snow, hail
- Collection: water returns to rivers, oceans, groundwater
Conservation
- Rainwater harvesting
- Reduce wastage; fix leaks
- Reuse water for gardening where possible
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Water cycle step
How do clouds form?
- 1Water evaporates from oceans, lakes
- 2Water vapour rises and cools
- 3Condenses around dust particles → clouds
Answer
By condensation of water vapour
Potable water
Why is ocean water not fit for drinking?
- 1Contains high dissolved salts
- 2Causes dehydration if drunk
- 3Needs desalination for use
Answer
Too salty for human consumption
Key Points to Remember
- ✓ Groundwater is recharged by rainwater percolation
- ✓ Floods and drought are water-related disasters
- ✓ Plants release water vapour by transpiration
Exam Tips
- • Draw labelled water cycle diagram
- • List freshwater sources
- • Suggest water conservation methods for your home
Practice MCQs — Water
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 6Score: 0/0
Water vapour condenses to form: