作业帮求一英语短文 介绍美国文化只要三十个句子就行,十句一段,共三段,介绍America culture,
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求一英语短文 介绍美国文化只要三十个句子就行,十句一段,共三段,介绍America culture,
求一英语短文 介绍美国文化
只要三十个句子就行,十句一段,共三段,介绍America culture,
求一英语短文 介绍美国文化只要三十个句子就行,十句一段,共三段,介绍America culture,
South America broke off from the west of the supercontinent Gondwanaland around 135 million years ago (Ma),forming its own continent.[4] Starting around 15 Ma,the collision of the Caribbean Plate and the Pacific Plate resulted in the emergence of a series of volcanoes along the border that created a number of islands.The gaps in the archipelago of Central America filled in with material eroded off North America and South America,plus new land created by continued volcanism.By 3 Ma,the continents of North America and South America were linked by the Isthmus of Panama,thereby forming the single landmass of the Americas.[5]