(1) The Precambrian eon

(2) We have seen how the basic aspects of solar eclipses appear in the sky; let us now return to our discussion of how humans have reacted to such events over the eons .

(3) In short, there is a real-life mystery about what transpired at the Synod of Whitby; the full truth still needs to be teased out from the various clues through the eons .

(4) The record has been much deformed, reconstituted, and obliterated during the subsequent Proterozoic and Phanerozoic eons .

(5) And through the eons there have been long periods of warming and cooling across the globe.

(6) I gathered my feet beneath me and tore forward, screaming a maniacal scream that I think I may have picked up at the academy eons and eons ago.

(7) It's possible: Astronomers believe that comets and asteroids hitting the Moon eons ago left some water behind.

(8) In doing so, the court presumably would have to face the question that has puzzled the patent office for decades and philosophers for eons : What makes us human?

(9) If violence was effective, we would have had a peaceful planet eons ago.

(10) Humankind has built up that understanding over the eons first and foremost by observing phenomena accurately, and then recording the observations assiduously.

(11) Over the eons the lunar spin rate has been damped by Earth's gravity, because the Moon's mass distribution is not uniform.

(12) This question, in various forms, has been pondered by physicists and philosophers for eons .

(13) When you see a natural stone formation, you are seeing the result of eons of active degradation and entropy.

(14) A mainstay of building construction for eons , until recent years the product's drab gray mien was considered too cold for all but the most esoteric decorative purposes.

(15) He suggested that the age of the Earth might be estimated by comparing the salinity of rivers with the salt content of the oceans, reasoning that the saltiness had built up over the eons .

(16) And unlike a lot of rock on Earth that has been unrecognizably recycled by volcanic activity over the eons , a lot of lunar material retains records of some of the first impacts.

(17) Despite our lack of knowledge, or perhaps because of it, researchers have divided the Precambrian into three time periods called eons .

(18) It is deep time that makes possible the blind movement of evolution, the massing and honing of minute effects over eons .

(19) Originally there were only two eons , the Precambrian and the Phanerozoic.

(20) So, the argument goes, over many eons a self-reinforcing, dynamic process emerged: people burned the land, eucalypts thrived, people burned some more.