How did ancient human migration cross the ocean?

Analysis:

Ancient humans could travel far across the shallow sea with islands. This is because:

(1) There is a geological age (i.e. Quaternary) in which human beings appeared, and the climate on the earth has experienced many changes of "ice age" and "interglacial age". At the same time, due to the crustal movement, the landform is constantly changing. During the ice age, when the sea became shallow, the submerged islands were exposed. It is an island group, and primitive people can cross the islands one by one, migrate to distant places, and even migrate to another continent that seems to belong to today. For example, American Indians moved from the islands in the shallow Bering Strait to Alaska during the Ice Age, and then moved south to other parts of North America, Central America and South America; Residents in southeastern Chinese mainland moved to Taiwan Province Province along the small island that has not yet sunk to the bottom of the sea; The residents of Oceania moved there in this way, because the sea was shallow at that time. Today, there are more colorful islands scattered in the southwest Pacific, and the sea between the islands is much shallower than today!

(1) We should not underestimate the navigation ability of ancient humans. In fact, primitive people built boats very early-the earliest was of course canoes. But don't underestimate these canoes, they rely on them to immigrate to new islands and even continents.

The above is not nonsense, but based on paleogeology, archaeology, anthropology, linguistics and other materials and research results. Limited by space, if you are interested, you may wish to find books on these aspects yourself.

Supplement: Mr. feng0746 1 has only a little knowledge of the drift of the mainland, so he makes such an immodest opinion. According to German Wei Gena's "continental drift theory", 300 million years ago, there was only one big "Pan-continent" on the whole earth, which began to drift and split from 300 million years ago, but even he thought that at least 3 million years ago, the shape of the continent was the same as today. As for the mainland being completely separated by the sea, it was much earlier, at least 10 million years ago. In front of them, they have been separated by the ocean. Excuse me, Mr. Feng 0746 1- Juren 4: Where was the "Pan-continent" before the continental drift at that time? If you don't migrate across the sea along the shallow islands, where can you go by land? Moreover, archaeology proves that the earliest human remains discovered in America and Oceania are no more than 20,000 years ago. This shows that they all migrated from other continents. Physical anthropology and ethnology studies also show that American Indians and Mongolians in Northeast Asia belong to the same race, as do the aborigines in Oceania islands such as Australia and New Zealand. In a word, the materials and research results so far show that the indigenous people of America and Oceania migrated from the Asian continent. Besides, we are discussing scientific issues. We should be reasonable and well-founded, and calm down. What does this mean? "The ancients made many canoes and died crossing the sea?" Like we're discussing serious scientific issues?