What is quantum physics? -,-​

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.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2