One reason: Plowing large areas of land
A few more reasons: poor farming practices, farmers would loosen up the soil, and the land was deforested, making it loose the roots that held the soil in place.
I think its mathematics,i could be wrong but i would mathematics
The Europeans tried so hard to find an all-water route to the Spice Islands becuase they wanted to find a faster route to the New World. Going by land took to long so they wanted a short cut.
Answer: They wanted to find a faster route to the New World.
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