But convection currents are ultimately at the mercy of temperature differences because these are what create pressure differences in the first place. The pressure difference between two locations is called a pressure gradient, and the force that actually moves air as wind is called the pressure gradient force.
oÂ·nus. n. 1. A difficult or disagreeable responsibility or necessity; a burden or obligation. 2. Responsibility for an error or fault; blame: Each side wants to avoid the onus of having started the disagreement. 3.
Similarly, Theseus is part of the foundation myth relating to Athens. He is likely to be the summation of a number of strong leaders who created the systems and united the tribes that built up Attica, with Athens as its major city â rather similar to the story of Romulus and Remus founding Rome.