Answer :
b. depth
Having depth means the opposite of being superficial. To get a measure of depth, one must measure in a downward manner. (for the ex: to measure the depth of the Caribbean Sea, we need to measure from the surface to the floor. That would be our depth measure).
Having depth means the opposite of being superficial. To get a measure of depth, one must measure in a downward manner. (for the ex: to measure the depth of the Caribbean Sea, we need to measure from the surface to the floor. That would be our depth measure).