What form of electricity killed the wheat and other crops in the dust bowl?

Static electricity.

The Dust Bowl was a period of severe drought and dust storms that damaged the ecology and economy of the American prairies during the 1930s. Because of insufficient knowledge of the ecology of the plans, farmers had conducted extensive plowing of the soil, and displaced the native grasses that normally trapped soil and moisture. The Dust Bowl forced tens of thousands of families to abandon their farms and relocate to other states, which were at the same time affected by the Great Depression.

Another effect of this dust was that it contributed to the creation of static electricity.  So much built up between the ground and airborne dust that blue flames leapt from barbed wire fences. Static electricity could also short out engines and car radios.

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.