Three basic types of magma: 1  Mafic or Basaltic-- SiO2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na. 2  Intermediate or Andesitic-- SiO2 55-65 wt%, intermediate. in Fe, Mg, Ca, Na, K. 3  Felsic or Rhyolitic-- SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na.
intensity noun [U]. âº the âquality of being âextreme in âstrength or âforce: Simone âsings with âemotional intensity. The âlight âhit us with such intensity that we âducked. âº art Intensity in a âwork of âart âdescribes the âstrength of the âcolor, âsound, âlight, or âfeeling. (Definition of intensity from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
Reference has been made in the preceding chapters to the term intensity in relation to. ultrasound, without giving it explicit scientific meaning. In this chapter, the concepts of.intensity and power of ultrasound are discussed in some detail.efinition: The intensity, I, relative to a reference intensity 10, is defined as: Relative intensity (dB) = 10 logw (1/10). The dB values will be positive if the intensity of interest, I, is larger than the reference. intensity, 10, and negative if I is less than 10.