1 inch of rain per year is less than many of the world's most arid places get. That's a real desert, and probably could not support any grass.
In the Sahara desert, which occupies half of the continent of Africa, the annual rainfall ranges from 0.8 to 3.9 inches per year. You can see that 1 inch per year is near the bottom of the Sahara's range !
it is actually very little for the grassland
1 inch of rain per year in a grassland is considered very little, as grasslands typically need at least 10 to 30 inches of rain annually to thrive. This insufficient amount would not support the necessary vegetation. Therefore, ecosystems in grasslands require much more precipitation than 1 inch per year.
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