Hold your breath
Try it now.
Discomfort comes quickly, because the body has been cut off from the oxygen it needs.
📚 Chapter Learning Kit
Nature's Treasures · Class 6 Science · Curiosity
English 5 topics 145 leveled MCQs 75 flashcards 5 games Free
Shared by a Veda teacher · Generated with Veda AI · Oct 2026
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Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. Here's a taste from this kit; the app has the full deck.
Days, days, minutes
The urgent one.
Food can wait some days and water rather fewer. Oxygen cannot wait many minutes.
Several gases, one name
Air is a mixture.
Nitrogen, oxygen, argon and carbon dioxide, with traces of several more besides.
Two-thirds under water
The figure to start with.
That much of the surface of the Earth is covered by it, which is why nobody expects a shortage.
Most of it is salty
And the catch.
Oceans and seas hold saline water, and that will not do for homes, farms or industry.
Freshwater
What we actually need.
Found as ice sheets and snow, as rivers and lakes, and underground.
📖 Smart notes
What you'll study, topic by topic
1
Air, and the Firki That Turns
Hold your breath and you find out how little time the body will wait. Air is a mixture, mostly nitrogen, and the part that keeps you going is only a fifth of it.
- Air is not one gas but a mixture of several, and it surrounds the whole Earth.
- Of every hundred parts of air, 78 are nitrogen, 21 are oxygen and 1 is everything else.
- The last part is shared between argon, carbon dioxide and a few other gases.
~30 min · full explanation, examples & memory tricks in the app
2
Water Everywhere, and Hardly Any to Use
Two-thirds of the planet is under water, and almost none of it can be drunk. The gap between how much there is and how much we can reach is what makes every drop worth saving.
- About two-thirds of the surface of the Earth is covered by water.
- Most of that water sits in oceans and seas, and it is saline, which means salty.
- Saline water will not do for homes, for farming or for industry.
~32 min · full explanation, examples & memory tricks in the app
3
The Cow, the Grass and the Sun
Two children argue about where a grazing cow gets its energy. Settling that one argument properly shows why the Sun stands behind every meal anybody has ever eaten.
- Every plant and animal on Earth depends on the Sun, which is the chief supplier of energy here.
- Sunlight is what lets plants prepare their own food.
- Animals eat plants and grow on them, and we take food from plants and animals alike.
~30 min · full explanation, examples & memory tricks in the app
4
Forests, Soil and the Rock Underneath
Fallen leaves feed the soil that grows the next tree, and the soil itself came from rock broken down over thousands of years. Everything here is slow, and that is the point.
- Forests are large areas carrying a dense growth of many kinds of plants.
- They are a natural home for wild animals, birds and insects, giving food and shelter.
- Forest cover has been shrinking, mainly through large scale cutting of trees by people.
~34 min · full explanation, examples & memory tricks in the app
5
Fuels That Run Out, and Ones That Do Not
Petrol, coal and natural gas took millions of years to form and will be gone in far less. Sorting resources by how fast nature replaces them is what the last section of this chapter is for.
- Petrol, diesel and kerosene are all obtained from petroleum.
- Petroleum, natural gas and coal together are called fossil fuels.
- They grew out of the remains of tiny organisms and of plants, buried far below ground.
~34 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
145 questions laddered from warm-up to topper-level, each with an explanation. A taste:
Air is best described as:
Beginner
A a mixture of several gases
B a kind of very light water
C an empty space with nothing in it
D a single pure gas
Show answer & explanation
a mixture of several gases
Several gases together carry the one name.
Out of every hundred parts of air, nitrogen takes:
Beginner
A 21
B 78
C 1
D 50
Show answer & explanation
78
More than three quarters of the whole.
A pie chart of the air is drawn and the second largest slice of it is labelled. Out of every hundred parts, oxygen takes:
Beginner
A 78
B 21
C 1
D 99
Show answer & explanation
21
About a fifth, which surprises most people.
Consider these statements about what air is made of. I. Nitrogen takes 78 parts out of every hundred parts of air. II. Oxygen takes 1 part out of every hundred parts of air. III. Argon, carbon dioxide and the rest together take about 1 part. Which statements are correct?
Advanced
A I and II only
B II and III only
C I and III only
D I, II and III
Show answer & explanation
I and III only
I and III are correct. II is not: oxygen takes 21 parts in a hundred, and it is the remaining gases together that come to one.
🃏 Flashcards
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75 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
🎮 Learning games
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Categorization
Memory Match
Fact Or Myth
Sequence Builder
Speed Quiz
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