We Need Water Chapter Notes | Science Class 2 ICSE PDF Download

Introduction

Water is essential for all living things, including humans, animals, and plants. It covers more than half of the Earth's surface and is used for various activities like drinking, cooking, and cleaning. This chapter explains the importance of water, its sources, how to keep it clean, and ways to save it to ensure it remains safe and available for everyone.

Sources of Water

• Rain is the primary source of water on Earth.
• Rainwater collects in puddles, ponds, lakes, streams, rivers, and seas, known as surface water.
• Some rainwater seeps deep into the ground, called groundwater.
• Groundwater is accessed by digging wells or using tube wells and handpumps.

Drinking Water

• In villages, wells and handpumps are common sources of drinking water.
• In towns and cities, water is purified and stored in large tanks before being supplied through taps.
• Potable water is clean, tasteless, colorless, and odorless water safe for drinking.
• Water should be boiled and filtered to remove germs before drinking.
• Drinking water must be stored in closed containers to keep it clean.

Saving Water

• Water is precious and should not be wasted.
• Turn off taps after use to prevent water wastage.
• Avoid letting the tap run while brushing teeth.
• Repair leaking taps to save water.
• Use water wisely while bathing to avoid wastage.
• Collect and store rainwater in tanks, drums, buckets, jugs, or bottles for later use.

Keeping Water Clean

• Dirty water can cause waterborne diseases like typhoid, jaundice, and cholera.
• Human activities, such as throwing garbage or washing clothes in water bodies, make water dirty.
• Prevent drain water from flowing into rivers to keep them clean.
• Avoid bathing or washing clothes in ponds or rivers.
• Do not defecate near water bodies to prevent contamination.
• Never throw garbage or leftovers into water sources.
• Educate others about the importance of keeping water clean.

Key Points to Remember

• All living things need water to survive.
• Rain is the main source of water.
• Surface water stays on the Earth's surface in rivers, lakes, and seas.
• Groundwater is water absorbed into the ground.
• Always drink clean and pure water.
• Avoid polluting or wasting water to protect this valuable resource.