I’m not sure but it might be B.
Density, because the core is made of metals like iron and nickel
This movement is called convection. It can be found in liquids, gasses and rheids - solids that can also experience movement ( on a big time scale), such as the earth mantle. One of the types of convection is diffusion: net movement of gasses from higher to lower concentration areas.
A. large, low coastal plains
C
The houses are made to last for centuries
