美国队长英文台词,介绍美国的小短文5句话

美国队长英文台词,介绍美国的小短文5句话

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.