5. list three pieces of evidence that support the idea that the dust bowl was "the worst hard time."

Dust storms        

Great depression  

Children died from dust pneumonia

Explanation:

The Dust Bowl happened in America because of the climatic changes that brought strong winds, drought and clouds of dust. The reason for the Dust Bowl was the extensive farming that was done after World war I. The dust storms called black blizzards, which covered Texas and Oklahoma. The Southern Planes were affected by drought in the 1930s. The Great Depression of 1920s created difficulty for the people to sell wheat in shops because of the fall in the stock exchange.  Children died as it was hard for them to breath in the air, which caused the lungs to be filled with dust, resulting in inflaming the alveoli.

what are local authorities doing to fix the problem

explanation:

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain