The surface of Earth is composed of large tectonic plates that are constantly shifting as they float on top of molten rock. Which process must occur in the mantle to make the plates move? Select one:

Ridge pushing.

Subduction.

Convection currents.

Core cooling.

Why does physical weathering speed up the processes of chemical weathering? a) physical weathering requires abundant water, as does chemical weathering. b) physical weathering produces fresh surfaces for chemical weathering to attack. c) chemical weathering can occur only on small surfaces, not large ones. d) chemical weathering requires salt, which is provided by salt wedging.

What was one effect of european influence on southeast asia? new roads and railroads were constructed. rulers built palaces in the european architectural style. the vietnamese absorbed much of the european culture. the islamic religion spread throughout the region.

How does central place theory explain patterns in the size and distribution of cities?