ERS111H5S Lecture Notes - Lecture 5: Mid-Ocean Ridge, Continental Margin, Pangaea

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20 Oct 2018
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ERS111 WEEK 4 THURSDAY AND WEEK 5
Diagram***
Detect changes in magnetic field
Striped magnetic fields of different magnitudes
Chuck weight off their boat and measure how much rope goes down into the ocean
Wasn’t until the invention of sonar than we knew the depth of the ocean
Mid ocean ridge: mountain plane in the middle of the ocean
Mapping locations of earthquakes
Earthquakes happen when rocks are moving due to energy
pangaea
Evidence of glaciation that was timed at around the same found on all continents
Everything was once clustered at the south pole
Size of sand grains, composition of sediments
We can say that one environment in the past is the same as it is today
Before dinosaurs
These animals/plants couldn’t have travelled over oceans as the world is today
Same age and graphical position
Continents move very slowly over time
Diagram**
Magma might be forcing continents apart
Normal or reversed polarity
Also look at magnetic field in rocks
Diagram***
Diagram**
Map of tectonic plates of earth
2 types of continental margin
Active: where we have plate boundaries
Passive: where there is no active plate boundary, no volcanos
Diagram***
Lithosphere at plate boundary is thin
Asthenosphere is pushing upwards
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