Here's why:

* The asthenosphere is a layer within Earth's mantle. It's a semi-solid, viscous layer that lies beneath the rigid lithosphere.

* The movement of the asthenosphere is driven by convection currents. These currents are caused by heat from Earth's core rising to the surface. Hotter, less dense material rises, while cooler, denser material sinks, creating a cycle of movement.

* This movement of the asthenosphere drags the tectonic plates on top of it. This is what causes plate tectonics, leading to earthquakes, volcanic eruptions, mountain formation, and other geological phenomena.

Structures on Earth, such as mountains and volcanoes, are the *result* of tectonic plate movement, not the cause. They are formed by the interaction of tectonic plates at plate boundaries.

Therefore, it's not accurate to say that structures on Earth move the asthenosphere. It's the other way around: the movement of the asthenosphere drives the formation of structures on Earth.