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).
Definition: (noun) - Emphasis is a principle of art which occurs any time an element of a piece is given dominance by the artist. In other words, the artist makes part of the work stand out, in order to draw the viewer's eye there first. Frequently, emphasis is achieved by means of contrast.