ESS102H1 Lecture Notes - Plate Tectonics, Structure Of The Earth, Hydrosphere
11 Dec 2013
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They interact ex. more co2 in oceans than in atmosphere, even more in rocks. Isolated: closed off, no relevance to anything happening outside of it. Closed: few things affect it, ex. earth affected by sun. Open system: direct effects; asteroid arrives and carries into space. We live on this, 2 types: oceanic (7km thick), mainly basaltic rocks, density of 3. 3gm); and continental (30-50km) granitic rocks. Some waves move along surface, others under surface. Stress builds as a result of pressure (two plates moving against each other), movement not steady, but jolts. Primary: arrive first, move fastest, horizontal waves, side to side, slinky against a wall. Secondary: arrive second, slower, rope against a wall, vertical waves, shake waves. Seismographs: heavy weight suspended on a spring, if there"s a quake, the ground moves up (block stays still), needle attached to block will leave pattern on piece of paper attached to bottom of thing.
