Were allcontinents once snuggled together in a mammoth land mass surrounded ... Recent studies indicate that the earth’s magnetic field has reversed at least nine times in the past 3,600,000 ...
A long time ago (way long), all of the earth's continents were squished together—one supercontinent and one superocean. You could basically walk from South America into Africa, or from Africa ...
Lavas from hotspots - -whether erupting in Hawaii, Samoa or Iceland -- likely originate from a worldwide, uniform reservoir in Earth's mantle, according to an evaluation of volcanic hotspots.
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