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2023-11-30
Most people believe that the Earth formed about 4.6 billion years ago. In the early stages of formation, the height of the regions was basically the same, and there was no obvious division of land and sea. About 4 billion years ago, a crust of firmer rock appeared on the Earth's surface. It was only 3.6 billion years ago that the Earth's surface was covered by a layer of water. In other words, the Earth at that time had a primordial ocean that spread across the globe. Then, over time, the earth cooled continuously, causing a certain amount of contraction. As a result of the contraction, the Earth's surface is concave and convex, like a dried and shrunk apple, the surface will show uneven folds. Shrinkage also causes the shell, which is not strong enough, to crack. As a result, molten magma from the Earth's interior spews out along the cracks. Over time, these eruptions of magma piled higher and higher, and finally became volcanic islands above the primordial ocean. According to the distribution of the oldest known rocks, the first land islands were probably located in the western part of present-day Australia, western Greenland, and southern Africa. After the island appeared, the rocks on the island were weathered and eroded under the action of the sun's light, heat and the gravity of the earth itself. The weathered, eroded detrital material was transported around the island and deposited to form the early sedimentary layer. Later, with the evolution of the Earth's crust, the sea became a mulberry field. These early sediments were also lifted out of the sea, increasing the size of the island. Some of these nearby land islands, as they continue to expand, eventually spliced together into a larger land mass. Of course, the formation of land is not always in the direction of small and large development. Some of the larger land masses are sometimes broken up into smaller pieces as the Earth evolves. Some have even been bombarded by huge meteorites, transforming into a deep crater and being resubmerged by the sea. Especially after the occurrence of plate movement, the land and the land will be connected by drift and collision, such as the Indian subcontinent, which is spliced together with the Asian continent through such a role. Conversely, other continents broke apart and drifted to become what they are today, such as Africa and South America. It should be noted that the above view of the formation of continents is not the only theory used to explain the origin of continents. With the development of human space exploration activities, people have obtained many new Revelations from the material phenomena of other celestial bodies, especially from the huge impact craters widely existing in cosmic celestial bodies. Some researchers believe that: Perhaps the formation of the sea and land is not as said before, the ocean is primitive, and the land is later; It is more likely that the continents originally existed and the oceans developed from craters formed by huge meteorite impacts.
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