examples of regions with differing crop yields

Question 1

what regions have consistent high yields and why?

Answer 1

eastern asia
north america
western europe

availability of resource, water

Question 2

what regions have moderate yields and why?

Answer 2

india
south america
western africa

they can be at risk of environmental limitations like droughts and flooding especially due to climate change

Question 3

what regions have little to no yields and why?

Answer 3

central australia
saharan africa
eastern russia

theres extreme environmental limitations such as drought and temperatures which is unsuitable for crop growth