How can gravity's role in tectonic plate motion be described

Gravity is one of the 3 main causes of plate movements, in addition to convection of materials in the mantle and the Earth's rotation. 

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.