The test may cause momentary gagging because the back of the throat is a sensitive area, but it should not be painful. The sample your doctor collects is taken to a laboratory, where it is put on a plate that allows any bacteria on it to grow. This process is called a culture.
Often these are called transition zones which represent the start and end of a specific region and can be large or small. For example, the transition zone between Sub-Saharan Africa and North Africa is rather large because there is a mixing between the two regions. Regional geographers study this zone as well as the distinct characteristics of Sub-Saharan Africa and North Africa.
The Intertropical convergence zone (ITCZ), also known as the Intertropical Front or the Equator ial Convergence Zone, is a belt of low pressure girdling Earth at the equator. It is formed, as its name indicates, by the convergence of warm, moist air from the latitude s above and below the equator.onvergence-A contraction of a vector field; the opposite of divergence. Convergence in a horizon tal wind field indicates that more air is entering a given area than is leaving at that level. Convergence-Coming together; piling up of mass.