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Question
Find from the story one word for the following.
a low constant sound made by cats ______
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Solution
a low constant sound made by cats - Purr
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Read the text below and summarise it.
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
Discuss the following statement in groups of two pairs, each pair in a group taking opposite points of view.
Why do you think Professor Gaitonde decided never to preside over meetings again?
The poet encourages her brother in the second part of the poem by telling him about the brighter side of life. Discuss with your partner and make a list of the expressions in the poem that mean encouragement.
- Brighter garden
- ________________
- ________________
The Emperor says he had realised earlier that Abdul has great talent. Does this tally with his actions? Give your opinion.
Using your imagination, write about a beautiful region - its landforms, water bodies, flora and fauna, night sky, people, etc.
Sit quietly for some time. Close your eyes and listen carefully to all the sounds that you hear. Can you guess what sounds they are, who or what is making that sound? Note down what you heard.
Does Chulong want to earn money honestly?
Fill in the table given below.
| S. No | Problems faced by the hatchlings | Effect | Solution |
| 1. | Pollution | Survival of sea turtles becomes difficult. | Reduce the usage of plastics. |
| 2. | Predators | ||
| 3. | Human Activities |
Brain of a robot is the______.
Bertha was very good but very proud too.
