Each year, field workers travel from the southwestern united states to eastern washington to harvest apples. this movement is an example of a. permanent migration b. periodic movement c. transhumance d. commuting

Each year, field workers travel from the southwestern United States to eastern Washington to harvest apples. This movement is an example of periodic movement.

Periodic movement may involve millions of US workers crossing international borders to find employment.

For instance, migrant labor is  a common form of periodic movement involving millions of worker in the US and tens of millions of workers worldwide who cross internationl borders  searching for employment and becoming immigrants.

what are local authorities doing to fix the problem

explanation: what are local authorities doing to fix the problem