The pie chart below shows the main reasons why agricultural land becomes less productive. The table shows how these causes affected three regions of the world during the 1990s.

The pie chart displays the factors that lead to

land

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degradation

while

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the table below indicates the data

of

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on

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land

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degradation in different regions

due to

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factors

Correct article usage

the factors

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mentioned.

Overall

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, it can be seen that deforestation and over-grazing are the main

reason

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reasons

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why agricultural

land

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declines

Wrong verb form

declined

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, Europe had the

high

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highest

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proportion of

land

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degraded in 1990.

Over- gazing

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Over-gazing

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, hit the highest point at 35%, is the biggest cause

to

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of

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global

land

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degradation.

This

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data is five times as much as the other factors. Deforestation and over-cultivation

constitutes

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constitute

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30% and 28%, respectively. Of the three regions, Europe had the greatest ratio of degraded

land

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during the 1990s, at 23%.

However

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, the biggest factor was not over-grazing but deforestation, which made up 9.8%. Oceania was the second most affected region, with

the

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a

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total of 13%. A surprising factor was that over-cultivation had no effect, and

this

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was mostly by over-grazing, at 11.3%.

Finally

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, North America accounted for a small minority, only 5% of the

land

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degraded and over-cultivation, responsible for 3.3% was the main factor.