展开世界全图,你会发现地球上的陆地分布很有意思,几乎都呈倒三角形,而且多拥簇在北半球。但有一员则比较独特,它像一叶小舟孤独茫然地漂浮于浩瀚的大洋之中——这就是澳大利亚。 在距今2亿年前的时期,地球上各块大陆几乎连成一片,构成一个泛大陆,当时气候温暖而半干燥,原始的哺乳动物开始产生,并不断发展。距今7000万年左右,泛大陆“合久必分”,逐渐分裂漂移,澳大利亚渐渐地被“兄弟”大陆所遗 Expand the world map, you will find the distribution of land on Earth is very interesting, almost all inverted triangle, and more crowded in the northern hemisphere. But one is more unique, like a leaf boat lonely in the vast ocean - australia. In the period of 200 million years ago, all the continents on the earth were almost connected together to form a pan-continent, when the climate was warm and semi-dry, primitive mammals began to emerge and develop continuously. About 70 million years ago, the pan-continent “for a long time to be divided,” and gradually split and drift, Australia gradually by the “brother” of the mainland left