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

The given pie chart indicates some reasons for

land

degradation around the world

while

the area was degraded by three continents

during

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over

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ten years from 1990 to 1999.

Overall

, one hand, it can be seen that over-grazing and

deforestation

accounted for

two thirds

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two-thirds

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of

land

degradation.

On the other hand

, in

Northnorth

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North North

America, Europe and Oceania,

over-cultivation

,

deforestation

and Over-grazing were the most effective causes of

land

disintegration during a decade. In the pie chart, 35% of

land

depreciation belonged to over-grazing and it

followed

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was followed

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by

deforestation

and

over-cultivation

with less than a third and 28% respectively.

Moreover

, only other reasons with 7% caused to

degrade

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degradation

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the

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of the

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land

. In North America,

over-cultivation

with 33% was the most effective cause

to degrade

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of degrading

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land

;

however

,

deforestation

had the lowest proportion with almost nil (0.2%). In Europe, though

deforestation

experienced the

the

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apply

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highest percentage of

land

decline with 9.8 % , over-grazing decreased by almost half (5.5 %).

Nevertheless

, in Oceania, over-grazing took place roughly ten times more than

deforestation

.

In addition

,

although

over-cultivation

never occurred in Oceania, North America and Europe saw it with 7.7% and 3.3% respectively.