Hot and Cold desert

       One-fifth of the Earth's land is covered by Deserts and in every continent they are found .In this 

 region one-sixth of the Earth's population that is about more than one billion people actually 

 are living there .Only about 10% of the deserts have sand dunes.

There are two types of deserts :

1- Hot deserts 

2- Cold deserts 

Hot Deserts:

                                   

* The largest hot desert in the world is Sahara Desert.

* The temperature there rises up to 50 degrees Celsius during the day but in the night it reaches up to      

  

   -18 degree Celsius . 

* About 250 millimeters of rainfalls per year.

* Animals like Camels are adapted in such a way that they can go without food and water for many 

   days. Many of animals are nocturnal and remain underground for most of the time.Birds are 

   carnivorous like Eagles, Vulture etc.can be seen flying around in search of prey.

                                 

   

* Desert plants are adapted to this climate by either  growing long roots or  they have special 

    means of storing and conserving water for example Cactus.

                         

Cold Deserts:

 * Some deserts are always cold like in the regions of Arctic and  Antartica and other mountaineous        

  

  regions like Himalayas .

* Temperature for nine months are extremely cold from -2 to -40 degrees Celsius and three months of     

  summer with temperature up to 12 degrees Celsius. 

* Here it also rains 250 millimeters per year.

* The animals which live there are adapted to harsh cold climate for example Polar bear, Arctic fox ,       

  

 Penguins etc.

                                     

* The plants in these regions includes mosses ,lichens ,grasses, herbs and dwarf shrubs. there are no      

   

 trees there because of the thin soil layer which thaws and refreezes each year preventing larger        

   

 plants to grow.