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CBSE Class 6 · Science

Nature's Treasures

Official NCERT chapter from Curiosity (book code fecu1). ExamMaster notes are original teaching at CBSE Class 6 depth.

This lesson follows the official chapter “Nature's Treasures” in Curiosity. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 6
  • Easy level
  • 8 concepts

1Air

Air is the mix we breathe and the mix that weather rides in. A treasure-word here means we use it and we can dirty it. A sealed room with stale air is a cost you can name.

“Air is free so waste it” skips the dirty-cost.

Figure. Air is a mixture you can name: mostly nitrogen, then oxygen we use, plus carbon dioxide and water vapour. Box sizes are equal on purpose — the percentages are the fact, not the drawing.

How it works

  1. Name a useBreathe, dry clothes, fly a kite.
  2. Name a cost if we dirty itSmoke you can point to.
  3. Name one smaller-dirt jobLess open burning if that is the job you can do.

2Water

Usable water is a treasure: drink, cook, grow. The ocean is huge; the tap’s usable freshwater is not the same pile. Waste is unused leaving.

Skipping the drink-job is not this saving.

Figure. The same water can be ice, liquid, or vapour. Ice keeps a shape; liquid takes the cup; vapour fills the room. A sink-or-float test is a different test from naming the state.

How it works

  1. Name a useDrink, wash, irrigate.
  2. See unused leavingA tap left open.
  3. Stop the unused leavingSame job, less waste.

3Energy from the Sun

Sunlight warms, lights, and feeds green plants’ food-making. A solar panel is one human use. The Sun is not a switch you invented; it is a source you can name.

A closed box in a cupboard is not this Sun-source.

Figure. Sunlight is the school energy source. One path warms the ground; another hits a leaf and becomes food. A torch or a stove is not this chapter’s Sun.

How it works

  1. Name a Sun-job you can point toWarmth, light, a plant in a window.
  2. Keep it as a source-wordEnergy from the Sun.
  3. Do not claim you made the SunA source, not a slogan.

4Forests

A forest is trees plus the living jobs that use them: home, soil-hold, shade. Cutting without a named plan has a cost: homes gone, soil loose. Forest as treasure means useful and limited.

A single potted plant is not this forest-case.

Figure. A forest is stacked rooms, not one tree. Canopy, understorey, and floor each hold different lives and different treasures. Cut the canopy and the rooms below change.

How it works

  1. Name a forest useHome, wood, soil-hold — if you can point.
  2. Name a cost of clearingJobs that fail.
  3. Keep one forest you can speak of as one caseNot every jungle on Earth.

5Soil, Rocks and Minerals

Soil grows; rock is the hard stuff under or around; a mineral is a named material we take from the ground. Each has a use and a taking-cost (a hole, a scar, less soil).

Calling every stone a mineral-mine is a blur.

Figure. Soil sits in layers over rock. Topsoil holds humus and roots; subsoil is poorer; rock is the parent. A treasure you can grow in is the top layer, and it is thin.

How it works

  1. Point to soil or a rock you can seeA sample.
  2. Name a useGrow, build, a named mineral if you were taught one.
  3. Name a taking-cost if we take too fastA hole, lost soil.

6Fossil Fuels

Coal, oil, and gas formed over a time you cannot rerun this year. Burning them does a job (heat, move) and has a cost (smoke, a pile that does not grow back on a school calendar).

A campfire of this year’s twigs is not this fossil-fuel case.

Figure. Coal, petroleum, and natural gas sit under soil as buried stores. They are useful because they burn, and limited because a school lifetime will not remake the seam.

How it works

  1. Name coal, oil, or gasA fossil fuel.
  2. Name a jobHeat, electricity, a vehicle — as taught.
  3. Name that the pile is limited on a human calendarA treasure with a taking-cost.

7A treasure is useful and limited

Useful alone is a tool. Limited means you can empty the local pile or dirty it. Treasure in this chapter is both words together.

“Infinite air, infinite coal” is the miss.

Figure. A treasure is useful and countable. A well that holds 10 buckets still holds only 3 after 7 are taken. Useful does not mean endless.

How it works

  1. Name a useUseful.
  2. Name a limit or a dirty-costLimited.
  3. Keep bothThat is the treasure-word.

8Using a treasure has a cost you can name

Use is allowed. Cost is the leftover you can point to: waste water, smoke, a cut hill. A use with no named cost is a poster.

Shame about every sip of water is not this cost-word — unused leaving is.

Figure. Using a treasure has a cost you can name. Wood from a forest is the use; a bare hill and a flood risk are the cost. If you cannot name the cost, you have not finished the test.

How it works

  1. Name the useThis tap, this wood.
  2. Name the leftover or the scarThe cost.
  3. Ask if a smaller leftover still does the jobThe protect-job.
A treasure in this chapter is
  1. Useful and limited — with a cost you can name
  2. Infinite by slogan
  3. Any shiny rock

Both words, plus a cost.

Notes

  • Mapped to the official NCERT chapter “Nature's Treasures”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “Nature's Treasures”. The wording is ExamMaster’s teaching, not a textbook recap.

Air
Air is the mix we breathe and the mix that weather rides in.
Water
Usable water is a treasure: drink, cook, grow.
Energy from the Sun
Sunlight warms, lights, and feeds green plants’ food-making.
Forests
A forest is trees plus the living jobs that use them: home, soil-hold, shade.
Soil, Rocks and Minerals
Soil grows; rock is the hard stuff under or around; a mineral is a named material we take from the ground.
Fossil Fuels
Coal, oil, and gas formed over a time you cannot rerun this year.

Practise Nature's Treasures

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  • A 4-question practice set that ends the chapter
  • 1 quick check with worked explanations
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