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spreading center

noun, Geology
a linear zone in the sea floor along which magma rises and from which adjacent crustal plates are moving apart. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for spreading center
  • Cutting a simple straight line will demonstrate the action at a spreading center.
  • Pillow basalts indicating location of former oceanic spreading center.

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