Wind erosion is so harmful because it removes the most fertile part of the soil.
So, the answer is option 4. It removes the most fertile part of soil.
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<h2>
,
,
,</h2><h2>

and

</h2>
Explanation:
Given,

To find, the exact values of the five remaining trigonometric functions of
= ?
We know that,

Where, b = base and p = perpendicular
By Pythagoras's theorem,
Hypotaneous, 

In IVth quadrant,
and
are positive.
,
,
,
and 