The movement of Earth materials where gravity is not the main force is plate tectonics.

Here's why:

* Plate tectonics is driven by convection currents in the Earth's mantle. These currents are generated by heat from the Earth's core, causing the mantle to move in a circular pattern. This movement drags the tectonic plates along with it.

* While gravity does play a role in the overall movement of plates, it's not the primary force driving them.

* Other movements like landslides, erosion, and the flow of glaciers are primarily driven by gravity.

Let me know if you'd like more details about any of these movements!