Physical Therapy Assistant Guide. Welcome to the PTA Guide, a physical therapy assistant education & career resource. We have everything you need to become a licensed PTA in your state. A few of the helpful things that you'll find here are information resources by state such as tools and info on PTA Schools, PTA license requirements, PTA Jobs, PTA salary data for states & major cities.
A dust devil in Ramadi, Iraq. Atmospheric instability is a condition where the Earth's atmosphere is generally considered to be unstable and as a result the weather is subjected to a high degree of variability through distance and time.hese indices, as well as atmospheric instability itself, involve temperature changes through the troposphere with height, or lapse rate. Effects of atmospheric instability in moist atmospheres include thunderstorm development, which over warm oceans can lead to tropical cyclogenesis, and turbulence.
Photo by: Hynek Kalista. Atmospheric circulation is the movement of air at all levels of the atmosphere over all parts of the planet. The driving force behind atmospheric circulation is solar energy, which heats the atmosphere with different intensities at the equator, the middle latitudes, and the poles.s air is heated at the equator, it rises in the troposphere, the lowest 10 miles (16 kilometers) of Earth's atmosphere. In the wake of the warm rising air, low pressure develops at the equator.