Which of the following produces the highest pitch? A sound wave with a frequency of 20 Hz
A sound wave with a frequency of 200 Hz
A sound wave with an amplitude of 2 m
A sound wave with an amplitude of 0.2
None of the above

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.