So how many licks would it take to get to the center of the Earth? Ummm . . .don’t try this at home Earth has three layers – same proportions as an apple Plate techtonics – lithosphere = crust + top layer of asthenosphere Three types of boundaries Convergent plates – subduction causes orogeny Divergent plates • What rock type is produced? Iceland’s geothermal energy Review – how does geothermal work? Advantages? Disadvantages? Transform faults Hot spots – place where magma rises to Earth’s surface & cools • Which island must be the youngest? So where is the hot spot and which way is the plate moving? Support your inference with observations.