✔ 最佳答案
世界是指地球吧!
太陽系是由於一粒巨大的星體爆炸而弄出來的星塵所形成的。
地球是because of one biggest piece of debris 吸引了較少的石頭集合在一起而形成的。
oxygen on the Earth comes because of the one kind of prehistoric stone.
water comes (專家估計)because of the 小行星帶 near jupiter, 吸引 by jupiter and crash onto the earth. those 行星 is made up by mainly frozen water. crash onto the Earth in a way of 密集式轟炸。
earth's atmosphere is come from the 引力 of the earth to 吸引太空中不同的 elements, after a series of chemical reactions to be formed.
額外的
earth's atmosphere can exist is just luck because 地核 is mainly form in iron so the earth can form a 磁場 to 反彈太陽粒子back to the space, to avoid the atmosphere corroded by the 太陽粒子. Of cource some of the 太陽粒子can go in but in the north pole and south pole. 所以有北極光出現. Mars have a atmosphere but it doesn't have a 地核made up of iron so the atmosphere was seriously destoryed by the sun. 如果不是 may be there are lives on mars today!!!!!!!!!!!!!!