Select each correct

Which of the following land use choices could lead to desertification?
1. removing all of the plants from a region
2. farming a region's soil heavily for many years
3. allowing livestock to overgraze a region

Allowing livestock to overgraze a region leads to desertification of land

Explanation:

Desertification is the conversion of a once fertile vegetative land to a barren land due to environmental changes. Many human activities and practices are often the cause of desertification of fertile lands.

Overgrazing plays a major role in desertification of lands. When huge number of farm animals is made to graze over vast lands, the entire vegetative cover will be lost.

When there is less protective vegetative cover, then the land becomes dry and barren allowing very less infiltration of ground water which reduces moisture content of the soil. This finally results in land becoming dry and deserted and the precipitation also becomes less. All these conditions recycle and reduce the vegetative growth.  

Unsustainable agricultural practices like growing heavily or intensive farming or removing plants in a region also causes desertification, but land use by overgrazing contributes more to desertification.

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]