Definition of an Extreme Environment
An extreme environment is a place which has harsh conditions that humans find hard to live in. These include extremes of temperature and landscape. Even though extreme environments are not suitable for living, there are still animals that can live in extreme conditions.
Where are the world's hot deserts located?
Hot deserts on Earth are generally situated 15 - 40 degrees North or South of the equator.
The Sahara Desert is situated in North Africa
Other hot deserts are in south North America, west South Amercia, South Africa and most of Australia
Problems People Face in the Desert
Keeping head cool to stop heat stroke
Lack of food and water - dew trap
Dangerous insects - eat them
Sand Storms on hills
Heat Stroke - shelter - for freezing cold nights also
Navigating at night - the stars
How the Desert Landscape is Formed
Erosion - The wearing away and removal of material
Weathering - The breakdown of rocks through mechanical, chemical and biological processes
Deposition - The putting down or dropping of material carrier by wind or water
Transportation - The movement of material by wind or water
How some Plants adapt to live in the Desert
Xerophyte - Plants adapted to life in dry areas e.g. Cacti
Saguaro Cactus features
- Thick waxy skin - reflects some of the Sun's heat and reduces loss of moisture
- Can store 8000 litres of water
- Spike instead of leaves - reduces loss of water and stops animals from eating it
- Pleats on plant - expand to absorb more water
- Moisture on stem
- Long but shallow roots - soak up as much water as possible after rainfall
- Seeds lay dormant till rainfall
How deserts can be used
Som Bendouin Nomads - sustainable way of life - use simple recources and herd lot's of animals for food.They also use clever ways to collect water They are nomadic so are always looking for fresh pasture. They have developed a very clever way of being able to live in a place where many people could not.
People who live in the desert may migrate to urban areas, such as big cities because life it is an easier way of life. They could also seek better living oppurtunties to make more income in the city.
The desert can also be used for recreational purposes
Causes and Affects of Desertification
Solutions to Desertification
Agroforestry - Plant between trees to avoid leaving areas bare
Contow Ploughing - Ploughing along contors rather than acroos them
Crop rotation - Leave the feild fallow for one year in every three or four
Population management - the root of the problem???