"Dlaczego śniadanie jest na ziemi?"
Tłumaczenie:Why is the breakfast on the ground?
W pytaniach o podmiot nie stosujemy inwersji https://www.gramatyka-angielska.info/s/2046/54167-Gramatyka-angielska/303647-Questions-Pytania-o-podmiot.htm
The article THE for breakfast isn't necessary in my opinion. As a native English speaker, my response was Why is breakfast on the ground. Although, I guess we could differentiate the specificity of breakfast in general versus a specific breakfast but I inferred from sniadanie breakfast generally.