What, according to this report, were three causes of the Dust Bowl? Is this a reliable account? Why or why not?

What circumstances conspired to cause the Dust Bowl? Economic depression coupled with extended drought, unusually high temperatures, poor agricultural practices and the resulting wind erosion all contributed to making the Dust Bowl. The seeds of the Dust Bowl may have been sowed during the early 1920s

I think it is precedent because A precedent is something that precedes, or comes before.