tectonic plates
tectonic plates:
http://geology.er.usgs.gov/eastern/plates.html
check out how square the India plate is; and the phillipine plate is sort of diamond-shaped. Also-- the carribean plate looks crunchy on both sides, to me.
Some fascinating geometries on the pacific floor:
http://pubs.usgs.gov/publications/text/Hawaiian.html
Pamphlet as a whole is very interesting.
http://pubs.usgs.gov/publications/text/dynamic.html
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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