Question

When you imagine the desert, you probably think of a very hot place covered

with sand. Although this is a good description for many deserts, Earth’s largest

desert is actually a very cold place covered with ice: Antarctica.

In order for an area to be considered a desert, it must receive very little

rainfall. More specifically, it must receive an average of less than ten inches of

precipitation—which can be rain, sleet, hail, or snow—on the ground every

year. Antarctica, the coldest place on earth, has an average temperature that

usually falls below the freezing point. And because cold air holds less moisture

than warm air, the air in Antarctica does not hold much moisture at all. This is

evident in the low precipitation statistics recorded for Antarctica. For example,

the central part of Antarctica receives an average of less than 2 snow every

year. The coastline of Antarctica receives a little bit more. Because Antarctica

gets so little precipitation every year, it is considered a desert.

When precipitation falls in hot deserts, it quickly evaporates back into the

atmosphere. The Antarctica is too cold to hold water vapour, so there is very

little evaporation. Due to this Iow rate of evaporation, most of the snow that

falls to the ground remains there permanently, eventually building up into

thick ice sheets. Any snow that does not freeze into ice sheets becomes caught

up in the strong winds that constantly blow over Antarctica. These snow-filled

winds look as if it is snow, though snowfall is very rare there, blizzards are

actually very common in Antarctica.



2) Mention two conditions required for declaring an area to be a desert.​

Answer 1

Answer:

The conditions are

1 the place should have sand and sand only

2 there should be camels there

Answer 2

Deserts are areas that receive very little rainfall. People often use the adjectives “scorching,” “arid,” and “empty” to describe deserts, but these words do not tell the complete story. Palaeontology is the study of the history of a desert.

Two conditions that are required for declaring an area to be a desert are as follows:

• Little precipitation-In order for an area to be considered a desert, it must receive very little precipitation.
• Most experts agree that a desert is an region of land that receives no more than 25 centimeters (10 inches) of rainfall a year.
• More specially, it must receive an average of less than ten inches of rainfall—which can be rain, sleet, frozen rain, or snow year.
• Humidity is near zero in most deserts.
• Light rains often disappear in the dry air, never reaching the land.
• Rainstorms sometimes come as aggressive cloudburst.
• Although some deserts are very warm with daytime temperatures as high as 54°C (130°F), other deserts have chilly winters or are cold year-round.

Most deserts, far from being vacant and lifeless, are home to a diversity of plants, animals, and other organisms. People have adapted to life in the desert for thousands of years.

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