Geological Hazards and Their Impact_McGeary_Date_040910

Geological Hazards and Their Impact_McGeary_Date_040910 -...

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Impacts Evidence of Past Impacts 1) Craters 2) shatter cones 3) ejecta layer 4) tectites 5) microtectites 6) shocked quartz 7) meteoritic dust (iridium anomalies) What are the odds? low probability, high impact event Earth History - bolide bombardment period 4.6 billion years ago – 3.9 billion years ago current hypothesis for moon formation (4.5 billion years ago) involves impact or near miss constant barrage of very small meteors examples: o 6m asteroid 1/year; 200m every 10,000 years o 1.5-2 km bolide could kill 25% people on the planet
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This note was uploaded on 08/30/2010 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.

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Geological Hazards and Their Impact_McGeary_Date_040910 -...

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