S wave -- a shadow zone appears when the velocity suddenly decreases 103-180 degrees from the epicenter. Describe the differences between P and S waves. P waves expand and contract, can move through liquid solid and gas. S wave moves up and down or side to side moves through only solids.
Optimal conditions to see the northern lights in Iceland is when skies are clear and dark (away from the city lights, in cold temperature and ideally from mid-September to mid-April.
Hotel Ranga. RangÃ¡ september 11 at:5 Â·. 52am our sky Expert Saevar SÃ¦var helgi bragason in an interview about stargazing and the northern Lights-in iceland check it out. Smile emoticon Stargazing and looking For The northern IcelandSÃ¦var In Icelandsaevar icelandsÃ¦var HelgiÂ´bragason is iceland s. stargazer in chief