Question: What was the name of the severe dust storm that occurred on April 14, 1935 as part of the era known as the Dirty Thirties, which was partially caused by failure to apply the correct dryland farming methods along with a severe drought?
Sentence (from "Dust Bowl"): With insufficient understanding of the ecology of the plains, farmers had conducted extensive deep plowing of the virgin topsoil of the Great Plains during the previous decade; this had displaced the native, deep-rooted grasses that normally trapped soil and moisture even during periods of drought and high winds.
Relevant evidence: No