Quote:
Originally Posted by Delvo
Also, is there any other explanation anyone here has heard of for why some big chunks of the crust are thin and some are thick?
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Yes. It is called Plate Tectonics.
The crust is thicker under the continents. It is thinnest in the rift zones, such as the mid-Atlantic ridge where the plates are pulling apart and molten material is flowing upward to fill in.
The plates move. The pattern of continents we see today has nothing to do with how the Earth looked 4 billion years ago, everything has changed since then.