The diagram below shows an area with a trench. Trench
Oceanic crust
Continental crust
Modified from image courtesy of USGS
Which of the following best explains what is happening to the oceanic crust as it is pushed below the continental crust?
OA. The oceanic crust erodes when it collides with the continental crust.
OB. The oceanic crust joins with the continental crust.
OC.
The oceanic crust crystallizes when it dives below the continental crust.
OD.
The oceanic crust melts as it gets pushed below the continental crust.

Do not include the unexpected results

Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f. 

The answer to this question is a