Challenger expedition 1872-1876. Woods Hole, Massachusetts Hopkins Marine Station, Stanford Scripps...
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Transcript of Challenger expedition 1872-1876. Woods Hole, Massachusetts Hopkins Marine Station, Stanford Scripps...
Woods Hole, Massachusetts Hopkins Marine Station, Stanford
Scripps Institute of Oceanography Friday Harbor Labs, Washington
Inductive approach: from specific observations to the general
Deductive approach: use general principles in predicting specific outcomes
How did we get these ocean basins?
• Continental drift– all the continents had once been joined in a
single ‘supercontinent’ called Pangaea
• Plate tectonics
• Sea floor spreading
Mid Ocean Ridge• Continuous chain of submarine volcanic
mountains encircling the globe– Largest geological feature on earth– Is not static; slips and slides
Collisions
• Creates trenches or subduction zones– Earthquakes &
volcanos– Less dense continental
crust floats on top; lasts forever
– Form volcanic islands