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.
An anion (â) (/ Ë Ã¦ n. aÉª. Én /), from the Greek word á¼Î½Ï (Ã¡nÅ), meaning up, is an ion with more electrons than protons, giving it a net negative charge (since electrons are negatively charged and protons are positively charged).