Pangaea. As the continent broke up, the pieces moving apart left bits behind, explaining the presence of nonvolcanic islands and island chains, according to Wegener. Where the moving pieces collided, mountains formed. They were thrust up either by the plowing of the continents through the sima,...
英语翻译1.dinosaurs first appeared about 230 million years ago 2.the earth was very different back then-there were no mammals,there were no flowering plants,and all of the continents joined together in a giant land mass called Pangaea 3.today sci
Pangaea was a supercontinent consisting of all of Earth’s land masses. It existed from the Permian through Jurassic periods. It began breaking up during the Jurassic period, forming continents Gondwanaland and Laurasia, separated by the Tethys Sea. Pangaea started to break up into two smaller ...
unique geological structures in the Americas terminate abruptly in the Atlantic Ocean and then continue again on the other side of the Atlantic, as if the structures had formed when the continents were together and then were cleaved as the continents tore apart. He showed that the fossil records...
1. The only force capable of splitting the continents apart is a pulling force suddenly tearing away enormous chunks of Earth’s crust. 2. For such a tremendous pulling force to appear, the surface area of the spontaneously splitting layer of the planet must have more than half of the ent...
The Earth formed as cosmic dust lumped together to form larger and larger particles until 150 million years had passed. At about 4.4 billion years, the young Earth had a mass similar to the mass it has today. The continents probably began forming about 4.2 billion years ago as the Earth ...