Read the passage given below:
The Sahara sets a standard for dry land. It’ the world’ 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 even 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 **** 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.
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’ summer months can cause the ** monsoon (which currently occurs between the Equator and roughly 178 N latitude) to shift to the north as it did 10,000 years ago, inundating North **.
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 round the same time).
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’* something scientists can ponder while sipping bottled fossil water pumped from underground.
“It’ the best water in Egypt,” Giegengack said-clean, refreshing mineral water. If you want to drink something good, try the ancient ***** treasure of the Sahara.
Answer the following questions :
(a) *** of plants and animals turned into rock are called ____.
(b) Scientists who study the layer of the earth are called……………….
(c) Relative humidity in Sahara can drop into the ............
