【Flyer杀G】小组-7.16 A50, by topfeng

topfengtopUID: 2854481

By citing the principle and process of the formation of earth,
and the possible interaction of comet which is made up largely of frozen water and gases, with earth while striking into together, the argument asserts being sure that the water in Earth’s oceans originated form comets. The argument’s conclusion is possible, but too many other provenances of water in Earth’s oceans are alternatives.

Firstly, without providing any evidence to support that a strike of comet into the earth once occurred in this manuscript, it’s hard to believe the conclusion that the water in Earth’s ocean come from comets. Some any historical records of this event are absolutely crucial to draw this conclusion, or the conclusion is just imaginative or hypothesis. The reason is simple. If this kind of
strike between earth and comet has never occurred, even assuming that the interaction between the two planets is correct as mentioned in the manuscript, the water of the Earth’s oceans cannot originated from comets.
Secondly, the interaction between earth and comet may be much more complicated than that described in the manuscript. It fails to justify that a strike between earth and comets generate enough energy and heat to molten the frozen water and gas in the comets. If the frozen water and gas maintain the same shape during the strike because of insufficient energy and heat, as gravitation of earth is just strong enough to hold gases and water vapor around it, it’s highly possible that the materials of frozen water and gas will be taken away as the continuous movement of comets after the strike. Even assuming that a strike between the earth and a comet produce enough energy and heat to molten the frozen water and gas, we still don’t know whether the earth’s gravitation is stronger than that of a comet. If not, the striking comet can hold the gas and water vapors as its atmosphere, which makes the conclusion incorrect.
Finally, the argument fails to eliminate other provenances from which comes the water of the earth’s oceans. As long as a strike of comets which is made up largely of frozen water and gases could bring water to the earth’s ocean, why not other planets which have the similar material as comet?
It’s still possible that the water of the earth’s ocean already exists during in the very first stage of formation, but has nothing to do with the strike with comets.
In conclusion, in order to support the conclusion in the manuscript, the followings researches are needed to be done: providing exact evidence which can prove the real happening of a strike between the earth and comet; the interaction between the two striking planets to prove that it could bring water to earth; no other alternative provenance of waters to the earth.