A glass of water that weighs 100 grams, is left out overnight. You weigh it the next day, and it weighs 90 grams. Where did the 10 grams of water go? It froze overnight.
It disappeared.
It evaporated into a gas.

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.