The origin of these rhyolite complexes is still not well-understood. Many folks think that Yellowstone, for example, is associated with a hotspot. However, a hotspot origin for most other rhyolite calderas doesn't work; they occur in subduction-related arcs. Examples of rhyolite caldera complexes include Yellowstone, La Primavera, Rabaul, Taupo, Toba, and others.
Average respiratory range by age is given below: 1  Newborns â Average 44 breaths per minute. 2  Infants â 20-40 breaths per minute. 3  Pre school children â 20-30 breaths per minute.  Older children â 16-25 breaths per 1  minute. Adults â 12-20 breaths per minute.  Adults during strenuous exercise â 35-45 breaths per minute.
Normal Breathing Pattern (Normal Respiration Cycle). Modern physiology textbooks suggest the following parameters of the normal breathing pattern (normal respiration) at rest for healthy subjects: - inhalation is 1.5-2 s. - exhalation is 1.5-2 s. - automatic pause of almost no breathing is 2 s. - tidal volume (the depth of inhalation) is 500-600 ml. - breathing frequency (or Rf-respiratory frequency or respiratory rate) is 10-12 breaths/min. The international physiological norm for the breathing rate at rest is 6 L/min (for a 70-kg man). Normal stress-free breath holding time after usual exhalation (that correlates with body-oxygen content) is 40 s. References for medical textbooks that provide these values are below.