ERS 101 Study Guide - Quiz Guide: Volcanic Arc, Oceanic Crust, Seafloor Spreading

• School: University of Maine
• Department: Earth Sciences
• Course: ERS 101
• Professor: A L I C E K E L L E Y

Document Summary

Earth s ys tem: atmosphere = e nve lope of ga s tha t s urrounds the pla ne t; 78% of nitrogen a nd 21% of. Oxygen. a urora is whe n the a tmos phe re inte ra cts with the ma gne tos phe re hydrosphere and cryosphere = wa te r cove rs 70% of the s urfa ce . 93% of the ea rth compos ition (iron, oxygen, s ilicon and magnes ium). biosphere: the a ggre ga te of a ll living orga nis m. Crus t: oce a nic (7-10 km thick, compos e d by ba s a lt a nd ga bbro), contine nta l (35-40 km thick, compos e d by gra nite ). Ne w oce a nic crus t s olidifie s from ba s a ltic ma gna a long the ridge a xis .