9. which one of the following statements does not accurately describe the diatonic scale as it corresponds to the setup on a piano keyboard? a. the black keys are used to produce the five notes that correspond to additional frequencies on the even-tempered scale for the key of c. b. the white keys are used to produce frequencies for the key of c. c. striking a key on a piano keyboard produces a sound with a specific frequency. d. a scale would include a series of eight notes, where the first and seventh notes have the same letter.

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary