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Question
What caused a blow to man’s ego ?
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Solution
We believed that one of the major differences between us and the rest of the animal kingdom was our ability to make and use tools this capability caused a blow to man's ego.
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The Great Desert Where Hippos Once Wallowed
The Sahara sets a standard for dry land. It’s the world’s largest desert. Relative humidity can drop into the low single digits. There are places where it rains only about once a century. There are people who reach the end of their lives without ever seeing water come from the sky.
Yet beneath the Sahara are vast aquifers of fresh water, enough liquid to fill a small sea. It is fossil water, a treasure laid down in prehistoric times, some of it possibly a million years old. Just 6,000 years ago, the Sahara was a much different place.
It was green. Prehistoric rock art in the Sahara shows something surprising: hippopotamuses, which need year-round water.
“We don’t have much evidence of a tropical paradise out there, but we had something perfectly liveable,” says Jennifer Smith, a geologist at Washington University in St Louis.
The green Sahara was the product of the migration of the paleo-monsoon. In the same way that ice ages come and go, so too do monsoons migrate north and south. The dynamics of earth’s motion are responsible. The tilt of the earth’s axis varies in a regular cycle — sometimes the planet is more tilted towards the sun, sometimes less so. The axis also wobbles like a spinning top. The date of the earth’s perihelion — its closest approach to the sun — varies in cycle as well.
At times when the Northern Hemisphere tilts sharply towards the sun and the planet makes its closest approach, the increased blast of sunlight during the north’s summer months can cause the African monsoon (which currently occurs between the Equator and roughly 17°N latitude) to shift to the north as it did 10,000 years ago, inundating North Africa.
Around 5,000 years ago the monsoon shifted dramatically southward again. The prehistoric inhabitants of the Sahara discovered that their relatively green surroundings were undergoing something worse than a drought (and perhaps they migrated towards the Nile Valley, where Egyptian culture began to flourish at around the same time).
“We’re learning, and only in recent years, that some climate changes in the past have been as rapid as anything underway today,” says Robert Giegengack, a University of Pennsylvania geologist.
As the land dried out and vegetation decreased, the soil lost its ability to hold water when it did rain. Fewer clouds formed from evaporation. When it rained, the water washed away and evaporated quickly. There was a kind of runaway drying effect. By 4,000 years ago the Sahara had become what it is today.
No one knows how human-driven climate change may alter the Sahara in the future. It’s something scientists can ponder while sipping bottled fossil water pumped from underground.
“It’s the best water in Egypt,” Giegengack said — clean, refreshing mineral water. If you want to drink something good, try the ancient buried treasure of the Sahara.
Staff Writer, Washington Post
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|
The call of the seas has always found an echo in me. Not being rich enough to roam in a private yacht, I have taken the poor man's way out. I swim across them. I have always been fascinated by the Indian ocean, whether at Mumbai, at Puri or at Gopalpur. I have swam in all these places and have felt the thrill. But the idea of swimming the Palk Strait did not occur to me until after I swam in the English channel. Steeped in the history and tradition of this nation, practically unconquered. teaming with hair-raising hazards, the sea between India and Sri Lanka had all the elements of challenge, danger and difficulty that tempted me. By the way, for preparation, I continued a strict and rigorous course of training which began in 1960. I also had to collect a comprehensive range of facts and information about this sea. Neither of these was easy. Despite all the information I had gathered, I soon found that very little was known about the Palk Strait, especially about the tides and currents. Everything about the English channel is known-there is the Channel Swimming Association, there are trained pilots there are wants to be hired, accurate weather forecasts, dependable tide tables and every other form of assistance was readily available. All that one needed was money. Here in the Palk Strait one has to find out firstly from where information could be obtained and then decide how much of it could be incorrect or misleading! |
A1. Rewrite the following as per their sequence in the extract: (2)
- I also had to collect a comprehensive range of facts and information about this sea.
- I have swam in all these places and have felt the thrill.
- All that one needed was money.
- Despite all the information I had gathered, I soon found that very little was known about the Palk Strait.
A2. Explain: (2)
What does the writer man by saving, "Steeped in the history and tradition of this nation, practically unconquered, teeming with hair-raising hazards, the sea between India and Sri Lanka had all the elements of challenge, danger and difficulty that tempted me"?
A3. Give reason: (2)
The narrator had an intense desire to swim in the Palk Strait. Explain the reasons for it.
A4. Personal Response: (2)
Do you like to have an adventurous life? Express your opinion.
A5. Grammar:
Do as directed: (2)
- Very little was known about the Palk Strait. (Rewrite as a negative sentence)
- I had to collect a comprehensive range of facts. (Rewrite the sentence beginning with 'A comprehensive ........)
A6. Vocabulary: (2)
Give the synonyms of the following words:
- rigorous - ______
- thrill - ______
