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 illustrates how four factors affected agricultural

land

degradation

around the world and the table presents the

percentage

of

land

degradation

in three distinct regions caused by these factors during

1990s

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the 1990s

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Overall

, as is observed from the pie chart, the main reason for

land

degradation

from the result of over-grazing. The ratio of over-grazing made up the biggest

percentage

(35%), followed by deforestation and over-cultivation,

stood

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which stood

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at 30% and 28% respectively.

Whereas

, the other factors only cover 7

percentages

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per cent

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.

According to

the table, the highest

percentage

of

land

degradation

occurred in Europe, where the main cause was deforestation (9.8% out of 23% of

total

Correct article usage

the total

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).

However

, deforestation was the lowest

percentage

of

land

degradation

in North America where the total

land

degraded only made up 5%.

This

figure was nearly half of that in Oceania in which over-grazing accounted for the highest

percentage

( 11.3% out of 13% of

total

Correct article usage

the total

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).

While

over-cultivation did not contribute to the cause of

land

degradation

in Oceania, it was the highest cause in North

American

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America

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( 3.3%) and the

second

factor in Europe (7.7%)