In comparison with other ocean basins, major sedimentary features such as continental rises and abyssal plains are relatively rare in the pacific. the primary reason for their scarcity in the pacific is that

Why are continental rises and abyssal plains relatively rare in the Pacific? This is because the extensive system of trenches along the active margins of the Pacific, trap much of the sediments flowing off the continents, preventing them from building the broad, flat abyssal plains typical of the Atlantic ocean basins.

+15-35=-20

going in opposite directions

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.