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.
One Response to âTop 8 Places to See the Northern Lightsâ. very good efforts to prepare complete tour guide about Northern Lights Iceland, Get Amazed with the Natural Northern Lights.Iceland is the best place in the world to see the beauty of the glaciers surrounded by huge mottled fields with cracks.