Which of these is the thinnest? a. plate b. lithosphere c. oceanic crust d. continental crust

The correct answer is option C, that is, oceanic crust.

Explanation:

Of the mentioned options oceanic crust is the thinnest. The topmost layer of the oceanic part of a tectonic plate is known as the oceanic crust. In comparison, continental crust is less dense than oceanic crust. However, continental crust is thicker in comparison to the oceanic crust that exhibits an average thickness of about 7 to 10 kilometers. Approximately 40 percent of the surface of the Earth is occupied by continental crust.