What is the layer with a taffy-like consistency where convection currents occur?

The layer with a taffy-like consistency where convection currents occur is the asthenosphere. Located beneath the lithosphere, the asthenosphere is part of the upper mantle and plays a crucial role in tectonic plate movement. The convection currents in this layer are driven by heat from the Earth's interior, facilitating the movement of the overlying tectonic plates.