Q.What is the major difference between the transform boundary and the convergent or divergent boundaries of plates?

The key difference lies in what happens to the crust at the boundary. At convergent and divergent boundaries, plates are either colliding or pulling apart, which creates or destroys the crust and produces dramatic features like mountains, volcanoes, and deep trenches. At a transform boundary, plates slide horizontally past each other, so the crust is neither created nor destroyed.

Because the plates grind past one another, the main result is intense friction and stress that builds up along the fault line. When this stress is released suddenly, it causes earthquakes. Unlike convergent or divergent boundaries, transform boundaries do not produce volcanic activity or mountain building, since there is no melting of rock or compression of the crust. …

The whole story of plate tectonics is about what happens when giant slabs of the Earth’s lithosphere meet. Convergent and divergent boundaries are the dramatic ones — mountains thrust up, oceans split open, volcanoes erupt. Transform boundaries are the quiet troublemakers. The plates don’t collide and they don’t separate; they grind sideways, like two hands rubbing past one another. That single difference — the direction of motion — changes everything about what the boundary does to the planet.

At a divergent boundary, plates move apart. Magma rises into the gap, cools, and forms new crust. This is how mid-ocean ridges work, and why the seafloor spreads. At a convergent boundary, plates move toward each other. One plate dives beneath the other into the mantle, where it melts and is recycled. That is why deep ocean trenches and volcanic arcs sit along these zones. So in both cases, the crust is actively being made or unmade.

Now the transform boundary. Here plates slide past each other horizontally, with no gap opening and no collision happening. The crust is neither created nor destroyed. The plates just scrape along a vertical fault plane. The San Andreas Fault in California is the classic example — the Pacific Plate and the North American Plate are moving in opposite directions, side by side, and the friction between them builds up until it releases as earthquakes.