Class 4 Evs - ICSE-SCIENCE
Water - Sources, Water Cycle, Purification
In this chapter, Class 4 ICSE students explore the wonderful world of water, learning about its various natural sources like rain, rivers, lakes, and groundwater. The chapter details the continuous journey of water through the water cycle, explaining key processes like evaporation, condensation, and precipitation. Young learners will also understand why clean drinking water is essential for health and discover simple, effective methods of water purification such as boiling, filtering, and sedimentation. This chapter is fundamental for building environmental awareness and frequently appears in ICSE Science examinations through diagrams, definitions, and application-based questions.
Start Learning FreeKey Concepts
Sources of Water
Rain is the primary source of water on Earth, which fills up surface water sources like rivers, lakes, and ponds, as well as underground sources accessed through wells and tube wells.
Evaporation
The process by which heat from the sun changes liquid water from oceans, rivers, and lakes into water vapor that rises up into the air.
Condensation
The process where warm water vapor cools down high up in the sky and turns back into tiny water droplets, forming clouds.
Precipitation
When water droplets in clouds become too heavy to stay in the air, they fall back down to the Earth as rain, snow, or hail.
Water Purification
The method of making unsafe water clean and fit for drinking by removing dirt, germs, and harmful impurities through boiling, filtering, or using water purifiers.
Important Formulas
Board Exam Info
In ICSE Science examinations, this chapter typically carries around 6 to 8 marks. Common question types include labeling the water cycle diagram, defining processes like evaporation and condensation, and listing ways to purify water at home.
Frequently Asked Questions
Why does rain fall from clouds?
Rain falls when water vapor condenses into tiny droplets that group together to form clouds. As they cool and merge, they become too heavy for the air to hold, falling down as rain.
Why should we boil drinking water?
Boiling water kills harmful germs and bacteria present in it, making it safe for us to drink without falling sick.
What is the main source of water on Earth?
Rain is considered the main primary source of fresh water on Earth, which replenishes our rivers, lakes, and groundwater.
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