ERS103H5 Lecture Notes - Lecture 3: Feldspar, Inner Core, Basalt
Document Summary
Ers 103 lecture 3 journey to the center of the earth. Structure of the earth and magnetic field structure: crust, mantle, inner core, outer core, solid, liquid. Densest portion is centre, and least dense is surface. Earthquake seismic waves (cid:862)the ri(cid:374)g of fire(cid:863) relates back to volcanoes restricted to certain parts of the earth. How deep depends on lots of factors. We can study how waves go thru the earth. First ones recorded. professional waves very fast compressional waves travel through all materials, air, rocks, liquids s waves secondary waves. P-waves fast in solid iron sandstone p wave slow. Basalt slow solid vs. liquid results in different velocity s-waves. Disappears remerges shadow zones implies we know source and focus, earth"s i(cid:374)terior. Based on change in velocity, u can differentiate in diff parts crust, upper mantle, lower mantle, outer core, inner core. Near mountains thicker crust , plate tectonics thinner.
