What is the mechanical layer of earth that has the most active convection currents?

Asthenosphere, a mechanical layer of earth which has most active convection currents.

Explanation:

Earth is known as the active planet because there is still presence of volcanic activities and earthquakes. The mantle layer of the earth has liquid lava on which the tectonic plates floats. Asthenosphere is middle layer of mantle which contains solid rocks.

The mantle layer of earth has convection currents and when those current tries to escape up, volcanic eruption occur at the surface of the earth. There are still many active volcanoes at different places of the earth. When those active current tries to escape out it escapes from the weakest land through which it can escape.

asthenosphere - apex