I think the answer to your problem is Spanish
The lowest literacy rate is India since it has the lowest GDP.
Subsistence crops are grown for the direct benefit of the farmer and their family. Cash crops are grown to deliberately be sold. ... Cotton makes a poor subsistence crop because you can't eat it and it has to be processed before it's useful (ginned, spun and woven)
Well some rivers in Europe are used to transport goods. Sometime people even travel on them. River also can provide power.