French and Australian geologists have studied the composition of the rock Islands in the southern Indian ocean, and found that here is the formation of "embryonic continent." The study is published in the journal Terra Nova.
It is believed that the continental crust is built up on the borders of continents and oceans, in the so-called subduction zones, where oceanic lithospheric plates plunge into the mantle under the continent. When they are melted and mixed with the material of the base of the continental plates, granite is formed when magma rises and forms the upper, the "granite" layer of the continents.
A new study by German scientists shows that the height of the largest mountain ranges such as the Andes or the Himalayas, is not determined by the ratio of the speeds of rise and erosion, as previously thought, and tectonic forces holding the mountain at a certain level. The results were published in the journal Nature.
The highest mountain chains on Earth occur along the convergent boundaries of lithospheric plates. On such boundaries one of the plates is indented under another into the mantle of the Earth. This process is called subduction. Over millions of years of interaction in the collision point of the slabs of the mountains rise.