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Tuesday, October 21, 2008

Are these really subduction zones?

Here is the ages of the Oceanic Lithosphere:

In this map, the white colored in line is supposed to be Subduction Zones and the black dotted lines are supposed to be Sea Floor Spreading areas:

Source Map NOAA

So, are they really subduction zones though? I think they probably are. However, to me, it looks as though there is much more crustal spreading going on than there is subduction going on, a lot more. Perhaps that's due to the expansion of Earth's Iron Core as it cools.

Source: Expanding Earth Outline (?)