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

degradation

while

the table below indicates the data

of

Change preposition

on

show examples

land

degradation in different regions

due to

factors

Correct article usage

the factors

show examples

mentioned.

Overall

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

reason

Fix the agreement mistake

reasons

show examples

why agricultural

land

declines

Wrong verb form

declined

show examples

, Europe had the

high

Correct word choice

highest

show examples

proportion of

land

degraded in 1990.

Over- gazing

Correct your spelling

Over-gazing

show examples

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

to

Change preposition

of

show examples

global

land

degradation.

This

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

constitutes

Change the verb form

constitute

show examples

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

land

during the 1990s, at 23%.

However

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

the

Correct article usage

a

show examples

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

this

was mostly by over-grazing, at 11.3%.

Finally

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

land

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