What are the 2 forms of memory retrieval?

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

When you turn on a battery-operated device, an electrical circuit is

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.