Question

How does the idea of tectonics relate to volcanoes?

Answer 1

Hint :Tectonics may be a theory describing the large-scale motion of the plates making up the Earth's lithosphere since tectonic processes began on Earth between 3.3 and 3.5 billion years ago. The model builds on the concept of geological phenomenon. A thought developed during the primary decades of the 20th century.

Complete Step By Step Answer:
Most of the world's volcanoes are found round the edges of tectonic plates, both ashore and within the oceans. On land, volcanoes form when one tectonic plate moves under another. Usually a skinny, heavy oceanic plate subducts, or moves under, a thicker continental plate.
In the ocean, volcanoes erupt along cracks that are opened within the ocean bottom by the spreading of two plates called a mid-ocean ridge. Magma from Earth's layer rises up to fill these cracks. Because the lava cools, it forms a new crust on the sides of the cracks. These mid-ocean ridges are literally long chains of underwater volcanoes that circle the earth just like the seams on a baseball.
When the lava cools and hardens, it forms into the cone-shaped mountain we expect of as a volcano. Most of the world's volcanoes are found round the edges of tectonic plates, both ashore and within the oceans.

Note :
The idea of tectonics explains most of the features of the surface. It explains why earthquakes, volcanoes and mountain ranges are where they're. It explains where to seek out some natural resources. Some places are susceptible to earthquakes while others aren't.