An Overview of Cbse Class 6 Science Notes Chapter 14
Water is the essential day to day need of an individual.
Most of the household activities depend on water like bathing, washing, cooking etc.
It is also important because it is the basic demand of a human being to survive.
How Much Water Do We Use?
Water covers one-third of earth surface present in seas, oceans, in the form of glaciers etc.
But still only $2\%$ freshwater is available for drinking and other uses.
We use water in our day-to-day activities and for producing many new things.
Water is also used in agriculture as well as the industrial sector.
Where Do We Get Water From?
The $2\%$ water which is available for drinking and other use is present in rivers, lakes, ponds and wells.
The water in seas and oceans is salty therefore unfit for our use.
Water in rivers, lakes, ponds and wells comes from seas and oceans by the help of water cycle.
We also get water glaciers as it melts into water.
Water Cycle
Continuous circulation of water on the earth is called the water cycle.
The cycle involves evaporation of water from the surface of earth such as seas, oceans, rivers, lakes etc. to form water vapors
The water from the plant is also lost in the form of vapors by the process of transpiration.
As the water vapor is formed and moved upwards it condenses to tiny droplets by the process of condensation
These tiny droplets come together to form clouds and by the process of precipitation the water comes back to earth in the form of rain
This rain water is fresh and fit for our use.
The diagrammatic representation of water cycle is shown below
This is how the salty water from seas and oceans is converted into fresh drinking water.
Back To the Oceans
The land surface is slightly elevated from the water surfaces such as seas and oceans.
Therefore, water from the rain and glaciers all sweeps down into the seas and oceans.
Rain water and snow melts also recharge ground water.
Groundwater is water that is present below the earth's surface and is fresh for our use.
What if it Rains Heavily?
The excess rainfall increases the water level in water bodies which leads to floods.
Flood is the overflow of water which submerges land causing destruction.
Floods cause loss of livelihoods by washing away people and animals.
It also provides damage to infrastructures and disrupts the supplies of clean water causing a situation of water scarcity.
What Happens if it Does Not Rain for A Long Period?
No rainfall can decrease the water level in water bodies and ground water level also decreases due to excess transpiration which leads to drought.
Drought is the situation when there is no water available for even drinking, the complete dryness is drought.
Drought leads to the shortage of water supplies eventually leads to loss of livelihoods.
How Can We Conserve Water?
Out of surplus water present we have access to only a small fraction of water.
With an increasing population, the demand for water consumption is also increasing.
The increased demand for water consumption and careless use of this natural resource leads to shortage of water.
We must adopt some measures to conserve water.
Sustainable use of water can help us to save water for the future also.
Rainwater Harvesting
One major to conserve our source of freshwater is rainwater harvesting.
Rainwater Harvesting is a technique of conserving rain.
There are two types of rainwater harvesting techniques
Roof-top harvesting technique: In this rainwater is collected on the roof of house then it flows down in the tank on ground or pit in the ground through the channel of pipes.
Direct flow of rainwater in ground
Rainwater harvesting provides many benefits such as reducing demand on ground water, providing water for drinking purposes, reducing flood and soil erosion etc.
Chapter Summary - Water Chapter 14
In Class 6 Science Chapter 13, "Water," we delve into the incredible world of this vital resource. Discovering the properties and roles of water, students explore its uses in daily life and ecosystems. From understanding the water cycle to realizing its importance for sustaining life, the chapter provides a comprehensive view. Engaging experiments and relatable examples make learning enjoyable, giving a deeper appreciation for water. With clear explanations and practical insights, students grasp the significance of water in our environment. This chapter not only educates but also sparks curiosity, encouraging young minds to value and protect this precious element.
What are the Benefits of Referring to Vedantu’s Revision Notes for Class 6 Science Chapter 14 - Water
Dive into the refreshing world of Vedantu's Revision Notes for Class 6 Science Chapter 14 - Water! These notes are your compass to navigate through the wonders of water, making learning both enjoyable and effective.
1. Quick Summaries:
Sail through the waves of information with quick summaries, like a speedboat through a river, capturing the essence of key water concepts in a splash!
2. Simplified Complexity:
Imagine water flowing down a stream; Vedantu's Revision Notes gently guide you, simplifying complex water topics, and turning confusion into clarity.
3. Efficient Last-Minute Prep:
Just like filling a water bottle before a journey, these notes efficiently prepare you for exams even at the last minute, ensuring you're ready for the adventure of assessments.
4. Enhanced Retention:
Picture a sponge soaking up water – that's you, absorbing crucial information effortlessly with Vedantu's Revision Notes, enhancing your memory for a splashing success in exams.
5. Exam Preparation Support:
Dive deep into exam preparation with key points and tips as if you're equipped with a treasure map, ensuring you discover every hidden gem in the vast ocean of knowledge about water.
Conclusion
For an enhanced comprehension of this subject, NCERT - Class 6 Science Chapter 14 - Water, thoughtfully prepared by experienced educators at Vedantu, is your invaluable companion. These notes break down the complexities of Water into easily digestible sections, helping you grasp new concepts and navigate through questions effortlessly quickly in the last minute as well. By immersing yourself in these notes, you not only prepare for your studies more efficiently but also develop a profound understanding of the subject matter.
FAQs on Cbse Class 6 Science Notes Chapter 14
1. What are the main sources of water summarised in the Class 6 Science Chapter 14 revision notes?
These revision notes cover the primary sources of water as per the Class 6 syllabus. The key sources discussed are:
- Oceans and Seas: The largest bodies of water, though the water is saline and not directly usable for drinking.
- Rivers and Lakes: Major sources of fresh water for cities and towns.
- Groundwater: Water stored beneath the ground, accessed through wells, tube wells, and hand pumps.
- Rain: The purest form of natural water and a crucial part of the water cycle that replenishes other sources.
- Ice and Glaciers: Large masses of frozen fresh water found in polar regions and on high mountains.
2. How can I quickly revise the main stages of the water cycle from these notes?
For a quick revision of the water cycle, focus on the four main processes explained in the notes. The continuous circulation of water from the Earth's surface to the atmosphere and back is driven by these stages:
- Evaporation: The process where the sun's heat changes water from rivers, lakes, and oceans into water vapour.
- Condensation: As the water vapour rises, it cools down and changes back into tiny water droplets, which come together to form clouds.
- Precipitation: When the clouds become too heavy, they release the water in the form of rain, snow, or hail.
- Collection: The rainwater collects in rivers, lakes, and oceans, and also seeps into the ground, replenishing the groundwater.
3. How do these revision notes explain the role of plants in the water cycle?
The notes summarise the important role of plants through a process called transpiration. Plants absorb water from the soil through their roots. While they use some of this water to make food, they release the excess water into the atmosphere as water vapour through tiny pores on their leaves. This process contributes a significant amount of water vapour to the air, which then helps in the formation of clouds.
4. If ocean water is salty, why is the rain that comes from it fresh?
This is a key concept explained by the process of evaporation. When the sun heats the ocean, only the water turns into vapour and rises into the atmosphere. The salts and other impurities are heavier and are left behind in the ocean. This fresh water vapour then cools to form clouds and eventually falls as fresh rainwater. This is why rain is a source of fresh water, even though much of it originates from salty seas.
5. What is the difference between a flood and a drought as explained in Chapter 14?
Floods and droughts are two opposite effects related to the amount of rainfall. The notes clarify this difference:
- A flood is a situation caused by excessive rainfall. When it rains too heavily for a long time, rivers and lakes overflow their banks, and the water submerges surrounding land, causing damage to crops, homes, and life.
- A drought is a condition caused by a lack of rainfall for a very long period. Without rain, the soil dries up, water levels in ponds and wells drop, and groundwater becomes scarce, leading to a severe water shortage.
6. How does rainwater harvesting help in conserving water?
Rainwater harvesting is a key method for water conservation summarised in these notes. It is the process of collecting and storing rainwater instead of letting it run off. The two main techniques are:
- Rooftop Rainwater Harvesting: Collecting rainwater from rooftops and directing it into a storage tank or a pit in the ground.
- Recharging Groundwater: Allowing the collected rainwater to seep deep into the soil to raise the level of the groundwater table. This makes more water available for future use through wells and tube wells.
7. Why is it important to conserve water even though most of the Earth is covered with it?
While about two-thirds of the Earth is covered by water, most of it is in oceans and seas, which is saline (salty) and not fit for drinking, cooking, or farming. The amount of usable fresh water is very limited—less than 1% is easily accessible. As the human population grows, the demand for this limited fresh water increases. Therefore, conserving water is crucial to ensure that this precious resource is used wisely and remains available for everyone's needs now and in the future.
