1.   It would be most unwise at present to rely solely on luminescence interpretations of geological phenomena.

2.   Where they scrape against one another, earthquakes, volcanoes, mountain belts and all manner of geological phenomena arise.

3.   Andrews and the others were skeptical, thinking they would prove to be some geological phenomenon.

4.   Monument Valley is a geological phenomenon in southeastern Utah.

5.   The new findings, in particular, were considered the first strong evidence that the geological phenomenon known as plate tectonics has existed on another planet besides Earth.

6.   Valles Caldera has hot springs, gas vents and other features which geologists regard as classic examples of this geological phenomenon.

7.   He insisted the explosion was a natural geological phenomenon but Penilla said traces of explosives were found in the debris near the lake.