What makes marginal lands unsuitable for farming?

What makes marginal lands unsuitable for farming?

Correct Answer: drought
disease
flood
pestilence

Explanation: Many lands are marginal for farming. When rainfall is normal or high, the lands can produce. When rainfall is low, no crops grow. Drought makes marginal lands unsuitable for farming. Drought can also make good lands more difficult to farm. These changes will increase as temperatures warm.

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