What would most likely cause a landslide?

erosion?

Explanation:i think it is that because if there is a erosion ever so slightly at a mountain it would one day fall and create a landslide

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.