Tectonic plates move to the sides, diverge or converge, colliding. These two states form volcanoes. Volcanoes are an opening or crack in the earth’s crust, through which magma and hot gases can escape. When the tectonic plates diverge, the new magma rises upward, forming fresh batch of the earth’s crust. When the plates converge, they often creep one under the other. This is called subduction. Incredible power melts the stones of the subducted plate, forming magma. This is the second state that generates volcanoes.
A great way to look at the boundaries of plates is to find a volcano. They can be located on the continents, but the most interesting of them are still formed in the chains of islands, not at the borders of plates.
Where are the volcanoes?
In the world there are approximately 840 active volcanoes. Usually for a year only 20-30 eruptions. Most of the volcanoes are near the edges of giant slabs, which together constitute the outer layers of the Earth. In the world every 30 seconds there is an earthquake, and only some of them represent a real danger.
Oceanic volcanoes matter, because they help to form new islands. There are certain places that are not tectonic boundaries. These are the regions in which the hot spots of the earth are located. In them, the rising magma turns out to be concentrated and melts the bark. At the bottom of the ocean grows a volcanic mountain. Over time, the volcano grows until the island is shown above the ocean surface. If a plate passes over a hot spot, over time it can form a chain of islands like Hawaii.