What will the skydivers ke be when he land on the groun

Aballet student who learns with the of his instructor is demonstrating learning.

What are similarities and differences of reflection, refraction, diffraction and absorption?

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.