Answer is Retrograde motion
Most of the time planet moves in expected path near the ecliptic which is east to west. Some times each planet turns around and moves to the east for a period of time, then it turns around to head in west direction again making a loop or zig-zag against the star background. This is called retrograde motion. Thus retrograde motion is the change of direction of the planets in loop.
Statement that is true concerning continental crust is It mostly contains heavier and denser minerals than the mantle.
<h3>What is Continental crust?</h3>
Continental crust can be regarded as the layer of igneous as well as sedimentary, and metamorphic rocks.
This layers do form geological continents as well as shallow seabed close to their shores, and mostly contains heavier and denser minerals than the mantle. .
Therefore, option B is correct.
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