CONVECTION CURRENTS IN THE ASTHENOSPHERE AND THE FORMATION OF LAND MASSES In the asthenosphere, molten magma is continuously heated by the Earth's core. This heating creates convection currents that move in cycles from bottom to top and back again. Over time, these currents cause the movement of tectonic plates, leading to the formation and spreading of continents and islands. This powerful process plays a key role in shaping the Earth's surface, forming features like mountains, volcanoes, and i