In a velic closure, the velum moves up and comes into contact with the rear wall of the pharynx thereby blocking the inflow of air to the nasal cavity. By preventing air escape via the nasal cavity and permitting air escape via the oral cavity alone, oral sounds are produced. This type of closure produces consonant sounds like p, w, v, and x.
In a velar closure, there is a combination of two actions. The velic closure takes place in addition to the back of the tongue lifting and coming into contact with the velum. Consequently, air passage through the nasal and oral cavities is hindered and pressure in the mouth reduced. This type of closure results in click sounds.
According to Dr. Nadja Nesselhauf, velic closure refers to the manner of articulation while velar closure refers to the place of articulation.
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