Flat Earth Truther B.o.B is celebrating Earth Day with an appropriately titled, E.A.R.T.H. mixtape. E.A.R.T.H., which stands for Educational Avatar Reality Training Habitat, includes 10 tracks with no musical features. Instead, the mixtape samples scientists, experts, and even President Barack Obama. Of course, the tape also references other related topics including fossil fuel, the hotly debated topic of Climate Change, and of course the Earth's shape on "Fkn Science Bro."

This isn't the first time B.O.B. has defended his position that the Earth is flat through song. If you remember, he also dropped a track back in January that took shots at famed scientist Neil deGrasse Tyson who ardently dismissed B.O.B.'s claims. Tyson's nephew responded with his own diss track, "Flat to Fact." Yes, B.O.B. does allude to the feud on the mixtape and includes a follow up to his original "Flatline" with a second "Flatline" to close out the whole thing. The tape also follows B.O.B.'s projects named after other earthly elements, specifically WATER and FIRErespectively back in December and January. Listen to B.O.B.'s new E.A.R.T.H. mixtape on DatPiff below. For more B.O.B., you can also see him freak out about the mixtape not working on DatPiff and smoking some good greens provided by our good old Earth on his Periscope below. Happy Earth Day everyone.