We reviewed seismic waves and plate tectonics material today, went over homework questions, and demonstrated elastic rebound: when lithospheric plates stretch/compress and are deformed, elastic PE is stored. Rebound occurs when much of this energy is released (quake).
Tonight's homework regarding Wegener's continental drift theory and current rates of divergence in the Atlantic Ocean:
From Halifax, Novia Scotia (Canada, near Maine) to Agadir, Morocco (NE corner of Africa, near strait of Gibraltar), there is approximately 4915 km of ocean. The plates between these locations are expanding at a total rate of about 2.5cm per year (average).
How long ago would these two cities have been near one another?
AND:
From Rio de Janiero, Brazil (East Coast of S. America) to Lobito, Angola (W coast of Africa), there is 6090 km of ocean. The plates between these locations are expanding at a total rate of about 3.4 cm/year (average). How long ago would these two cities have been near one another?
BONUS: Look up these cities on a map online. Print out the maps while zoomed out to where you can see the entire continent they're on and cut them out. You should be able to guess the next step.... Look up Alfred Wegener if you need a hint. Bring in your completed work tomorrow to class.
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