When soil lacks nutrients needed for crop growth, farmers might add to the topsoil to promote the growth of crops. a. pesticides b. salt c. fertilizer d. subsoil

the dust bowl, otherwise known as the dirty thirties, was a huge dust storm that killed multiple (and i mean  multiple) farmer's crops, leaving them homeless, and foodless, and jobless. in california, there were 5.7 million residents, and the population shrank as mexicans were repatriated. however, when the dustbowl happened, a lot of people began to move to california. by 1940, 250,000 people had arrived. therefore, your answer would be  the population increased, massively.  i hope this !

explanation:

we will reach the goal of freedom in birmingham and all over the nation,

the name of the theory is landmass theory.