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Some areas of the world are simply not arable given current technologies or resources. There are a number of requisite conditions for land to be arable, e.g. able to grow crops on. Additionally, those requirements can change based on the crop being grown. For example, rice needs much more water than potatoes or olives.

The four main conditions that can prevent land from being arable are:

  1. The land is too dry -- This generally applies to both hot and cold deserts.
  2. The slope of the land or gradient is too high (even for terracing) -- This generally applies to mountains and canyons.
  3. The average temperature is too cold -- This generally applies to regions at latitudes greater than 50 degrees (60 degrees in Europe because of the Gulf Stream).
  4. The quality of the soil is too poor or surrounding plant-life crowds out crops -- This generally applies to tropical rainforests and areas with depleted soils.
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