If most of the grains are quartz and feldspar then the overall appearance of the rock will be light, while the opposite will be true if the minerals are mainly mica, pyroxene, amphibole or olivine. The colour of a rock with between 25 and 50% dark minerals is intermediate.
Full Definition of DISPLACE. transitive verb. 1. b: to remove from an office, status, or job c obsolete: to drive out: banish.2. b: to take the place of (as in a chemical reaction) : supplant. â disÂ·placeÂ·able \-ËplÄ-sÉ-bÉl\ adjective. See displace defined for English-language learners. See displace defined for kids.isplace implies an ousting or dislodging. supplant implies either a dispossessing or usurping of another's place, possessions, or privileges or an uprooting of something and its replacement with something else. supersede implies replacing a person or thing that has become superannuated, obsolete, or otherwise inferior.
DISPL is boat displacement in cubic feet. Clearly then, performance is a function of both power and weight, or sail area and displacement. Sail Area/Displacement ratios range from around 14 for a lightly canvassed motor-sailor to 20 or so for an ocean racer.