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:') It is the best explanation (in the reductionist - materialist milieu) not least because conditions on Earth's surface are still an unknown.

Carbon ratios suggest life present early in Earth's days
by Dale Gnidovec
Columbus Dispatch
Tuesday, August 26, 2008
The microdiamonds had surprisingly low ratios of C-13. One possible explanation is that they represent meteorites that bombarded the planet early in its history. Many meteorites are characterized by low C-13 ratios...

The researchers also suggested an even more intriguing explanation: Life processes produce residues with greatly reduced C-13 ratios. If the low C-13 ratios in the microdiamonds from Australia were produced by living organisms, there was life on this planet more than 4.2 billion years ago, almost as soon as it formed.

That suggests life might be present in many parts of the universe.
Conference on Evolution of Green Plants
by Kristine Calongne
Through Deep Green, the scientists found that primitive freshwater plants provided the ancestral stock from which all of the earth's green land plants are descended. This finding overturned the belief that the "land-plant invasion," that is, the movement of plants from water onto land, was led by seawater plants. This discovery could have profound ecological, medical and economic implications... The researchers have found that it was green algae -- the most primitive of freshwater plants - - that became terrestrial and gave rise to land plants. However, while many groups of green algae managed to conquer the land, only one specific group evolved into land plants. The scientists are still trying to figure out why.
The Origin of the Oceans
by Immanuel Velikovsky
Of the salts of the seas sodium chloride is by far the most abundant. The provenance of it is, however, a riddle. It was, and still is, assumed that the salts in the oceans originated mainly through importation from land, having been dissolved from rocks by flowing rivulets and rivers, themselves fed by underground sources, and the same process working on the rocks of the seabed. Terrestrial formations are rich in sodium, and in eons of time, it is assumed, the sodium washed out of the rocks supplied its content to the oceans; the seas evaporate and the concentration of these salts grows. But the rocks are by far not so rich in chlorine, and hence the problem... A part of the salts could be traced to the washing of lands and the floor of the seas; chlorine is known also to be discharged by volcanoes, but to account for the chlorine locked in the seas, volcanic eruptions, whether on land or under the surface of the seas, needed to have taken place on an unimaginable scale -- actually, it was figured out, on an impossible scale... Paleontological research makes it rather apparent that marine animals in some early age were more closely related to fresh-water fauna; in other words, the salinity of the oceans increased markedly at some age in the past.

Thanks for the links. Another piece of accepted wisdom that I have seen challenged recently is how the Earth's magnetic poles are produced. A new theory is that they are generated by the Earth's ocean currents rather than by the molten core of the Earth.

Extending the theory at out to the other planets - this would explain why Mars (which now has a residual magentic field) lost its magnetic field once it lost its oceans. If the Moon was once a part of Earth, then this would also explain the residual magnetic fields found in the Moon's crust.