As the plates of the earth move, three types of tectonic plate boundaries occur. Divergent boundaries occur when two plates move in opposite directions, such as the pulling apart of North and South America from Europe and Africa, which, according to the U.S. Geological Survey, happens at a ...
How Does a Volcano Form? What Causes a Volcano to Erupt? 7 West Coast Volcanoes Worth Watching 12 Dangerous Volcanoes Along the Ring of Fire
Metro systems have been regarded as one of the most effective ways to solve this problem [1], [2], and more metro tunnels will be built in the near future [3], [4]. However, metro construction not only needs to handle the coordination relationship between tunnels and dense urban ...