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CBSE Notes Class 6 Science Chapter 11 Nature’s Treasures
Nature provides essential resources such as air, water, soil, forests, and minerals that support life on Earth. In Chapter 11, Nature’s Treasures, students learn about different natural resources and understand their importance in our daily lives.
Students also learn why natural resources must be used wisely and conserved for the future. These CBSE Notes for Class 6 Science help students revise key concepts, understand the effects of overusing resources, and recognise the importance of protecting nature. Students can also explore Class 6 Science Notes to revise other chapters and practise questions.
1.0Nature’s Treasures Class 6 Science Chapter 11 - Revision Notes
Natural resources such as air, water, soil, sunlight, forests and minerals support life on Earth. They are renewable or non-renewable and must be used wisely through practices like rainwater harvesting, forest protection and energy conservation.
Key Concepts
- Concept of Natural Resources: Natural resources are invaluable gifts obtained directly from nature—such as air, water, soil, sunlight, trees, and minerals—that support life and human development.
- Man-Made Resources: Products created by humans using natural raw materials—including plastics, cement, furniture, and bicycles—are classified as man-made resources.
- Sun as the Primary Energy Source: Sunlight provides the heat and light necessary for plant photosynthesis, climate balance, and practical applications like solar cookers, water heaters, and crop drying.
- Composition and Essentiality of Air: Air is a natural mixture of gases consisting of 78% nitrogen, 21% oxygen, and 1% argon, carbon dioxide, and other gases that surrounds the Earth to sustain respiration and photosynthesis.
- Water Availability and Vital Functions: About two-thirds of the Earth is covered with salty water; freshwater is accessible from rivers, lakes, glaciers, and groundwater, vital for temperature regulation, waste removal, and plant growth.
- Forests as Lungs of the Earth: Forests maintain food chains, prevent soil erosion, recycle soil nutrients through decaying organic matter, and preserve biodiversity.
- Soil Formation through Weathering: Soil develops over thousands of years as rocks break down due to the combined action of sunlight, water, and living organisms.
- Rocks and Minerals: Rocks like granite, sandstone, and marble are composed of minerals that yield essential metals like iron, copper, aluminium, and gold for construction, electronics, and manufacturing.
- Origin and Uses of Fossil Fuels: Fossil fuels—coal, petroleum, and natural gas—formed from ancient buried organic remains over millions of years to supply energy for electricity, cooking, and transport.
- Renewable versus Non-Renewable Resources: Natural resources are divided into renewable resources that replenish naturally within a reasonable period and non-renewable resources that are exhaustible because they take millions of years to form.
Moving Air and Wind Power:
Moving air is called wind. Wind can move paper, start fires, and turn windmills used to grind grain, pump water, and generate electricity. Wind farms are found in places such as Muppandal, Jaisalmer and Kutch.
Water Conservation and Drip Irrigation:
Freshwater is limited and can become polluted. Drip irrigation saves water by supplying it directly to plant roots.
Rainwater Harvesting and Stepwells:
Rainwater harvesting collects rainwater from rooftops and stores it or allows it to recharge groundwater. Traditional stepwells, called Bawadi in Rajasthan and Vav in Gujarat, help collect and store water.
Solar Energy:
Sunlight helps dry clothes, preserve foods such as raw mango slices and obtain salt from seawater through evaporation. Solar panels convert sunlight into electricity.
Forest Conservation:
Van Mahotsav is celebrated in July to encourage tree planting. During the Chipko movement in Uttarakhand in the 1970s, people hugged trees to prevent them from being cut down. Sacred groves are also protected as part of traditional practices.
Soil Composition and Living Organisms:
Soil contains sand, small pebbles, decomposed plant matter and microorganisms. Earthworms loosen and turn the soil, helping plant roots grow.
Uses of Rocks:
Early humans made tools such as hand axes and arrowheads from rocks. Today, rocks such as slate, laterite and marble are used in construction.
Extraction and Uses of Metals:
Metals are obtained from mineral ores through mining. Metals such as gold, silver, copper and cobalt are used in everyday items, including mobile phones and vehicles.
Vehicle Fuels and Air Pollution:
Petroleum is used to produce fuels such as petrol, diesel and kerosene. Burning fossil fuels releases smoke and carbon dioxide. CNG and LPG are used as alternative fuels.
Conservation of Fossil Fuels:
Fossil fuels are limited resources, so we should save them by walking or cycling short distances, using public transport or carpooling, switching off unused electrical appliances and avoiding unnecessary engine idling.
2.0Terminologies to know - Nature’s Treasures
- Natural Resource: Any useful material or energy source obtained directly from nature that sustains life or satisfies human needs.
- Wind: Air in motion that exerts physical force on surrounding objects.
- Man-Made Resource: A synthetic material or item created by human processing of natural substances.
- Weathercock: A device or windvane used to indicate the physical direction of blowing wind.
- Drip Irrigation: An efficient agricultural watering system that delivers water drop by drop directly to plant roots.
- Rainwater Harvesting: The direct collection and storage of rainwater from building rooftops or land surfaces for future use.
- Stepwell: An ancient water storage structure—known as a Bawadi in Rajasthan or a Vav in Gujarat—lined with stone blocks to collect rain and seepage water.
- Van Mahotsav: An annual week-long forest festival celebrated in July to plant trees and promote environmental conservation.
- Weathering: The slow process of rock breakdown into soil particles caused by sun, water, and living organisms over thousands of years.
- Earthworm: A soil-dwelling organism that acts as a natural tilling agent by turning and loosening soil particles.
- Mineral: A naturally occurring inorganic substance found within rocks from which valuable metals are extracted.
- Mining: The industrial process of extracting useful minerals and metals from beneath or on the Earth's surface.
- Fossil Fuel: An exhaustible energy source—such as coal, petroleum, or natural gas—formed from dead plant and animal remains buried under sediments over millions of years.
- CNG: Compressed Natural Gas, a cleaner-burning vehicle fuel used as an alternative to petrol or diesel.
- Renewable Resource: A natural resource capable of being naturally replenished or restored within a reasonable timeframe.
- Non-Renewable Resource: An exhaustible natural resource present in limited quantities that cannot be restored within a human timeframe once consumed.
3.0Learning Guide for Class 6 Science Nature’s Treasures- Chapter 11
Textbook Experiments and Activities:
- Activity 1 (Breathing Exercise): Taking deep breaths in and letting them out demonstrates the vital importance of oxygen gas in air for human lung function and health, while taking care not to hold breath to discomfort.
- Activity 2 (Paper Firki Rotation): Constructing a simple paper pinwheel attached to a stick and moving it in open air demonstrates that moving air exerts mechanical force causing the firki to rotate.
- Activity 3 (Water Wastage Survey): Observing household tasks reveals that running taps during hand washing wastes up to 4 litres of water, whereas shutting off taps uses only 1 litre, and using drip irrigation prevents garden overwatering.
- Activity 4 (Soil Texture Comparison): Collecting soil samples from roadsides, gardens, and farms for visual and magnifying lens inspection shows that soils differ in colour, grain texture, and organic matter across locations.
- Activity 5 (Neighbourhood Fuel Survey): Surveying local vehicles shows that scooters and cars predominantly run on petrol, buses and trucks run on diesel, and auto-rickshaws use cleaner CNG.
- Activity 6 (Identifying Everyday Resources): Mapping daily activities to natural inputs shows that washing relies on water, clay toys rely on soil, firewood and rubber come from trees, and food comes from plants and animals.
Everyday Examples and Historical Context:
- Sitting in front of an electric fan causes loose paper sheets to blow away, proving the presence and motion of invisible air.
- Sliced raw mangoes placed under direct sunlight dry out as moisture evaporates, preserving them for pickle preparation.
- World Water Day is celebrated globally on March 22nd to highlight freshwater conservation.
- Historical Indian women protected forests in the 1970s Chipko Movement in Uttarakhand by physically clinging to tree trunks.
- Basic modern mobile phones contain trace amounts of extracted mineral metals like gold, silver, copper, and cobalt.
Safety Rules and Revision Tips:
- Safety Rule: Always wash hands thoroughly after collecting or touching soil samples because soil mixed with waste can harbour harmful pathogens.
- Safety Rule: Avoid holding your breath for excessively long durations during breathing exercises to prevent physical discomfort.
- Revision Tip: Remember resource categories using the 2x2 grouping method—classify by origin (Natural vs Man-Made) and replenishability (Renewable vs Non-Renewable).
4.0Explore Chapter-wise Class 6 Science Notes
5.0Additional Study Materials for Class 6 Science
6.0Find the Right Study Resources for Class 6
7.0Key Features of CBSE Class 6 Science Notes Chapter 11 : Nature’s Treasures
- The Foundation of Sustainability: This chapter moves from simply naming resources to understanding the global interdependency between humans and nature. It builds the critical base for environmental science and geography.
- Resource Logic Breakdowns: Provides a step-by-step analysis of how raw materials from the Earth are transformed into daily utilities, highlighting the energy cost of every product we use.
- Rapid Recall Mind Maps: Includes "Renewable vs. Non-Renewable" checklists and decision trees that help students classify energy sources based on their replenishment rate.
- Competency-Based "Green Challenges": Includes scenario-based questions, such as: "Create a 3-step conservation plan for a city facing a severe groundwater shortage."
- The Custodian Mindset: Develops the skill of ethical reasoning, teaching students that they are not just "consumers" of nature’s treasures, but their "guardians."