Which Are Causes Of Desertification Quizlet?

How is desertification linked to population growth?

Population growth is certainly a cause of desertification because it leads to the conditions in which soil is eroded.

For example, an increase in the number of people living in an area of the desert will mean that there are more mouths to feed and consequently more food needs to be produced..

What are the impacts of desertification?

What are the effects of desertification? Lack of vegetation cover for holding soil together and for grazing. Increased soil erosion. Crop failure, leading to famine .

Which is the greatest cause of extinction quizlet?

The primary cause of species extinctions is habitat destruction resulting from the expansion of human populations and activities.

Who is affected by desertification?

Africa is the continent most affected by desertification, and one of the most obvious natural borders on the landmass is the southern edge of the Sahara desert. The countries that lie on the edge of the Sahara are among the poorest in the world, and they are subject to periodic droughts that devastate their peoples.

How does Salinisation cause desertification?

Salinisation greatly reduces soil quality and vegetation cover. Due to the destruction of the soil structure, saline and sodic soils are more easily eroded by water and wind. … Salinisation induces desertification effects such as loss of soil fertility, soil structure destruction and compaction, and soil crusting.

What are the major causes of deforestation?

Direct causes of deforestation are agricultural expansion, wood extraction (e.g., logging or wood harvest for domestic fuel or charcoal), and infrastructure expansion such as road building and urbanization. Rarely is there a single direct cause for deforestation.

What are the impacts of desertification in the Sahel?

The effects of desertification In 2014 the UN stated that 20million people in the Sahel region of Africa faced hunger and required $2 billion in food aid due to desertification. The loss of vegetation can cause severe soil erosion. The nutrients in the soil get washed or leached away leaving soil infertile.

What are the four causes of desertification?

Various Causes of DesertificationOvergrazing. … Deforestation. … Farming Practices. … Excessive Use of Fertilizers and Pesticides. … Overdrafting of groundwater. … Urbanization and Other Types of Land Development. … Climate Change. … Stripping the Land of Resources.More items…

What is the meaning of desertification?

Desertification is a type of land degradation in which a relatively dry land region becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. … Desertification is a significant global ecological and environmental problem.

What three factors contributed to desertification in the Sahel?

The main factors contributing to desertification include drought, population growth, the spread of extensive agriculture, deforestation, rapid urbanization, the erosion of local political power, the lack of economic institutions and the absence of social institutions which have tended to reduce the capacity of the …

How is desertification linked to population growth quizlet?

Desertification is causing the droughts to began to get bigger and the people living in the Sahel to begin to be expanded into the desert due to them having no grass or water source. It is very hard for them to keep up with the growing population and not having enough resources.

How can we limit the negative impacts of desertification?

Strategies to reduce desertificationPlanting more trees – the roots of trees hold the soil together and help to reduce soil erosion from wind and rain.Improving the quality of the soil – this can be managed by encouraging people to reduce the number of grazing animals they have and grow crops instead.More items…

What will happen if desertification continues?

Across the world, desertification affects the livelihoods of millions of people who rely on the benefits that dryland ecosystems can provide. … Some 10 to 20% of drylands are already degraded, and ongoing desertification threatens the world’s poorest populations and the prospects of poverty reduction.

Which of these are causes of desertification?

‘Climatic variations’ and ‘Human activities’ can be regarded as the two main causes of desertification. removal of the natural vegetation cover(by taking too much fuel wood), agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.

Which are causes of desertification select three options quizlet?

What are the 3 main causes of desertification? 1) Over-cultivation. 2) Overgrazing. 3) Overuse of fuel wood…. Over-cultivation means cattle are taken to graze where there is little vegetation cover. Dryland pastoral economies rely on grazing. Loss of traditional knowledge means cattle are not moved regularly.

What is the process of desertification and what causes it quizlet?

Desertification: the process of fertile land transforming into desert typically as a result of deforestation and dought, improper agricultural practices.

Which are causes of desertification select three options?

deforestation.inappropriate farming practice.overgrazing by cattle on a certain land area.erosion of top layer of fertile soil.global climate change causes degradation of land.Dec 5, 2018

How can desertification be prevented?

Preventive actions include:Integrating land and water management to protect soils from erosion, salinization, and other forms of degradation.Protecting the vegetative cover, which can be a major instrument for soil conservation against wind and water erosion.More items…

How can desertification affect humans?

Land degradation and desertification can affect human health through complex pathways. As land is degraded and deserts expand in some places, food production is reduced, water sources dry up and populations are pressured to move to more hospitable areas. … the spread of infectious diseases as populations migrate.

What area is most at risk for desertification?

“The greatest risk of desertification (7.6 out of 10 on a scale produced using various desertification indicators) is in the subtropical desert regions – North Africa, the countries of the Middle East, Australia, South West China and the western edge of South America”, said Montserrat Núñez, lead author and a …

What’s the process of desertification?

Desertification is a process of continuous, gradual ecosystem degradation, during which plants and animals, and geological resources such as water and soil, are stressed beyond their ability to adjust to changing conditions.