This is an example of social inequality. Social inequality leads to the discrimination in the positions, statuses, or awards in between the people of a group or society.
This may be gender based, race based, cast based, or religion based.
Answer: crust
Explanation: the crust of the earth is the outer layer
I believe the answer is: Frame the problem
Framing the problem refers to the process of looking for a certain innovation or advantages to solve a certain problem.
The steps that needed to be done to do this process involve pinpoint the problem that wanted to be solved, collecting necessary information, analyzing the information, and create the best solution from the analytic
C.) A sound wave cannot travel in a vacuum because there are no molecules to transfer energy.