Corn Growth Group A (kg fertilizer per Acre) / Acre TitleCorn Yield (Bushels Per Acre)Group B (kg fertilizer Per Acre) / Acre TitleCorn Yield (Bushels Per Acre) 2 / A1180 / B115 4 / A2220 / B215 6 / A3240 / B316 8 / A4300 / B416 10 / A550 / B516 12 / A600 / B616 At what point did the corn yield begin to decline as the amount of fertilizer increased? A)6 kg B)8 kg C)10 kg D)12 kg

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.