📑 Table of Contents (tap a topic to jump)
1🌊 How Much Water Do We Really Have?
Earth looks like a giant blue ball of water from space, but most of that water is not fit for us to drink or grow crops with.
- Most of Earth's surface is covered with water — but almost all of it is salty water found in oceans and seas.
- Only a very tiny part of all this water is freshwater — the kind we can drink, cook with and use in farming.
- If all the water on Earth filled one big glass, the freshwater in it would only be about one small teaspoon!
- All living things — people, animals, birds and plants — depend on freshwater to survive. Without it, life on Earth would not be possible.
📖 New Words
- Freshwater:
- Water with very little salt — found in rivers, lakes, ponds and under the ground.
- Saltwater:
- Water with a lot of salt in it — found in seas and oceans; not fit for drinking.
2🏞️ Where Do We Find Freshwater?
Freshwater is found in many places around us — some on the surface and some hidden underground.
- Rivers, lakes and ponds are the freshwater sources we see every day.
- Glaciers and ice caps in cold mountain regions store huge amounts of frozen freshwater.
- Rain falling from clouds is also a major source of freshwater.
- Water stored deep under the soil, called groundwater, is another important source (we will learn more about this soon).
✨ Do You Know?Wular Lake in Jammu & Kashmir is one of the largest freshwater lakes in Asia — it even helps control floods by holding extra river water!
3🧊 The Three Forms of Water
Water is a bit of a magician — it can change its form depending on temperature, but it is still the same water!
- Solid — water freezes into ice, snow, hail or glaciers when it gets very cold.
- Liquid — the water we drink, that fills rivers, ponds and rain — this is water's most common form.
- Vapour (gas) — when water is heated, it turns into invisible water vapour, like the steam rising from a hot cup of tea.
- A simple test: put ice cubes in a steel glass — droplets form on the outside (vapour from air turning to liquid), and the ice itself slowly melts into liquid water.
📖 New Words
- Water vapour:
- Water in the form of an invisible gas, made when water is heated.
4🔄 The Never-Ending Water Cycle
Water keeps travelling — from the ground to the sky and back again — in an endless loop called the water cycle.
- Evaporation: The Sun heats up water in oceans, rivers and lakes, turning it into invisible water vapour that rises into the sky.
- Condensation: High up, the cooler air turns this water vapour back into tiny droplets, which gather together to form clouds.
- Precipitation: When clouds get heavy with droplets, the water falls back down as rain, snow or hail.
- This water flows back into rivers, lakes and oceans — and the whole cycle starts all over again, forever!
📖 New Words
- Water cycle:
- The constant, circular movement of water between the Earth's surface and the sky.
- Evaporation:
- Liquid water changing into water vapour due to heat.
- Condensation:
- Water vapour cooling down and changing back into tiny water droplets.
5🕳️ Groundwater — Water Hidden Underground
Not all rainwater stays on the surface — a lot of it quietly travels deep underground.
- When it rains, soil soaks up some of the water, which then sinks slowly through layers of soil and rock.
- Water that collects deep underground like this is called groundwater.
- We reach this water using wells, borewells, tube wells and handpumps.
- Open ground, gardens, ponds and trees let rainwater soak in easily and recharge (refill) groundwater.
- In cities with lots of concrete and paved roads, rainwater cannot soak into the soil — so groundwater does not get refilled as easily.
📖 New Words
- Groundwater:
- Water stored in layers of soil and rock deep under the ground.
- Recharge:
- The natural refilling of groundwater when rain soaks into open soil.
✨ Do You Know?The 'Statue of Unity' in Gujarat — the world's tallest statue at 182 metres — reminds us how, just like this giant structure, groundwater reserves are built up slowly, drop by drop, over a long time.
6⛰️ How Rivers Are Shaped by Land
Rivers don't choose their own path randomly — the shape of the land decides exactly where they flow.
- A river usually begins high up in the mountains, where melting snow or springs create a small stream.
- As it moves downhill, the river follows the natural slope of the land — flowing around high points and gathering in low points, just like seeds poured on a bumpy, tilted sheet of paper.
- The flowing water can also slowly reshape the land it passes through, carving valleys over a very long time.
- Rivers of India flow in different directions — some drain into the Bay of Bengal, others into the Arabian Sea, depending on which way the land slopes.
- Landform words to know: glacier, ice cap, waterfall, mountain, lake, dune, desert, valley and forest — all shape how and where water moves.
✨ Do You Know?The Luni river in Rajasthan is unusual — it is the only major Indian river that does not flow into a sea at all! It ends in the marshy Rann of Kutch in Gujarat instead.
7🐟 Life in and Around Water
Ponds, lakes and rivers are not just water — they are busy little worlds full of specially adapted plants and animals.
- Animals living in water have special body parts — like fins to swim and gills to breathe underwater.
- Birds like the pond heron have long legs and a sharp beak to catch fish, while the dragonfly lays eggs near water and eats mosquitoes.
- Water plants adapt in different ways: lotus and water lily float with roots fixed in the mud, water hyacinth floats freely, and reeds grow tall along the edges.
- Many water plant leaves (like the lotus) have a waxy, waterproof coating — this is why water simply beads up and rolls off instead of soaking in.
- Every creature in a pond is connected through a food chain — small fish eat insects, bigger fish eat small fish, and birds eat fish. If one link disappears, the whole chain is affected.
📖 New Words
- Aquatic:
- Living in or related to water.
- Food chain:
- The order in which living things depend on each other for food.
✨ Do You Know?The Fishing Cat, found in India's wetlands, has partly webbed paws that make it a brilliant swimmer — it even dives underwater to catch fish!
8🚰 Using Water Wisely
Water is precious and limited, so people have always found smart ways to use it and to save it for later.
- Seawater is used to make salt — in places like the salt pans of Gujarat, seawater is spread on flat land and dried by the Sun until only salt remains.
- Traditional structures like johads in Rajasthan are small earthen dams built to collect rainwater and help it soak into the ground.
- Villages like Hiware Bazar in Maharashtra show how communities working together on rainwater harvesting can become water-secure.
- Simple habits — fixing leaking taps, not wasting water while brushing, and reusing water for plants — help save this limited resource for everyone.
✨ Do You Know?India's first water museum, the Jal Shakti Museum in New Delhi, celebrates our country's water heritage and inspires people to conserve water.
🧠 Quick Recap — Chapter in a Nutshell
- Earth has plenty of water, but only a tiny fraction of it is freshwater that we can actually use.
- Water exists in three forms — solid (ice), liquid (water) and vapour (steam).
- The water cycle moves water endlessly between the Earth and sky through evaporation, condensation and precipitation.
- Rainwater that soaks into the ground becomes groundwater, drawn up through wells and borewells.
- Rivers begin in the mountains and flow according to the shape of the land, ending in seas like the Bay of Bengal or the Arabian Sea.
- Ponds, lakes and rivers support rich aquatic life — specially adapted animals and plants.
- Water must be used wisely and conserved, through traditional methods like johads as well as modern awareness.