Life In The Hot And Cold Deserts
desert no matter hot or cold, has very small amount of precipitation throughout
the year usually less than 25 cm a year and almost no vegetation. Deserts cover
about one-fifth of the earth's surface. Most deserts, such as the Sahara of
North Africa and the deserts of the south-western US, Mexico and Australia;
that occur near the Tropic of Cancer or the Tropic of Capricorn are hot. Cold
deserts, occur near the Arctic and in Antarctica or in the high mountainous
areas. Let us learn about the Sahara, a hot desert and Ladakh which is a cold
No. 11.1 the Sahara Deserts in Africa
Sahara (Africa) is the largest hot desert of the world. In the physical map of
Africa, we will find that the Sahara Desert covers a very large part of this
continent in the north, an area of about 8.5 million sq. km. It extends from
the shores of Atlantic Ocean in the west to Red Sea in the east. To its north,
are the Atlas Mountains? The desert covers parts of eleven countries of Africa
that include Morocco, Algeria, Libya, Egypt, Tunisia, Sudan, Chad, Mali,
Mauritania, Niger and West Sahara.
one-fourth of the Sahara is sandy; the rest is made of gravel plains/ plateaus
and bare rocky surfaces. The Sahara at some places, is more than 2,000 metre
high. Towards the south, it merges into the Savanna tropica grasslands.
Sahara is one of the world's driest deserts.
all areas of the Sahara receive less
Sahara landscape with sand dunes and carvan
this area was lush green with flowing rivers. The cave paintings in the
mountainous region of Gilf Kebir in the Sahara Desert which are about 10,000
years old contain images of people swimming. The engravings and paintings on
the Tassili Plateau in Algeria describe the region as the Savannah Grasslands
where large animals (land and water) like crocodiles were found.
of Gilf Kebir wall painting showing people swimming and Giraffe like animals
250 millimetres of rainfall; temperature is exceedingly high due to low
humidity and low cloud cover. The maximum temperature of 58°C has been recorded
in Al Aziziyah that lies in the Sahara Desert in Libya. The Sahara Desert has
scorching days; however, the nights are cooler due to rapid radiation of heat.
The temperature may fall as low as -17°C. June, July and August are the hottest
months. The winter months are cooler due to the bursts of dust laden winds that
are places in desert where underground water reaches the surface level and
farming can be carried on. Such water sources, around which crops can be more...