Deserts are arid regions that receive very little precipitation. They can be very hot during the day and cold at night, or cold year-round. While conditions are harsh, deserts support a variety of adapted plant and animal life through strategies like succulence in plants and nocturnal behavior in animals. Deserts exist on every continent and cover about one-fifth of the Earth's land surface, ranging from hot, dry expanses to cold, mountainous regions.

2. Deserts are areas that receive very little
precipitation.
Some deserts are very hot, with daytime; other
deserts have cold winters or are cold year-round.
One thing all deserts have in common is that they
are arid, or dry.
In all deserts, there is little water available for
plants and other organisms.
Deserts are found on every continent and cover
about one-fifth of Earth’s land area.
Some deserts are mountainous. Others are dry
expanses of rock, sand, or salt flats.

3.  Hot and Dry Deserts
 Semi Arid Deserts
 Coastal Deserts
 Cold Deserts

4.  TEMPERATURE: Temperatures in arid areas may get as high as 55
degrees C during the day and as low as 10 degrees C during the night.
RAINFALLAND CLIMATE: The climate of a desert is hot and dry.
The amount of rain in the desert varies slightly from desert to desert, but
on average, desert rainfall measures about 1 inch per year.
ANIMAL LIFE: Although the desert climate is very hot and dry, there
is an abundance of animal life. Varieties of lizards, rats, owls, tortoises,
antelopes and bobcats are just a few of the many desert dwelling animals
that have had to evolve to survive.
PLANT LIFE: there are thousands of plants that flourish in a desert
biome. The two most numerous are the ocotillo, a flowering plant, and
the saguaro cactus.

5.  Tundra are tree less plains.
 Tundra is the coldest of all the biomes.
Extremely cold climate
Low biotic diversity
Simple vegetation structure
Limitation of drainage
Short season of growth and reproduction
Energy and nutrients in the form of dead organic
material

6. Human economic activity has been scarce on tundra.
Occasional mineral resources, such as fossil fuel and ores
occasionally appear in tundra.
Arctic Fox
Grizzly Bear
Musk Ox
Polar Bear
Snowy Owl
 Arctic Moss
Arctic Willow
Bearberry
Diamond-leaf Willow
Labrador Tea