Which wave types refract when crossing from one medium to another? sound waves electromagnetic, sound, and water waves electromagnetic waves water waves only electromagnetic and sound waves

Plss anybody know how to do this? ? i need the answers from a through d

An object's buoyant force and weight mean the same thing. a. trueb. false

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.