"I know about the mass-extinctions and geological upheavals," Keene agreed.

In any case, the geological upheavals occurred all over again, only this time there was no giant spark or a reversal of the magnetic poles.

This obviously had been formed by some geological upheaval, and then smoothed and deepened by the river.

I'm reading a massive geological upheaval occurring beneath the tessera of Alpha Regio.

Everywhere lies evidence of geological upheavals and lava flows from distant millennia.

He and his shipmates had splashed down in the middle of Pandora's greatest geological and social upheaval.

Sometimes a shifting current or a geological upheaval has washed layers away; otherwise they have simply deepened.

Later geological upheavals re-oriented the rivers in the region to mainly flow northeast into the Zambezi.

Here, centuries ago, a massive geological upheaval had spewed a layer of hard sinian limestone onto the surface of the hill.

Each system has revealed the same disturbing geological upheavals on every planet.