Which statement describes the endothermic reaction represented by this graph?

A. Energy is absorbed during the reaction.

B. The amount of potential energy remains constant.

C. Energy is given off by the reaction.

D. Energy is first absorbed, then given off.

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.