What is the difference between arteriosclerosis and atherosclerosis?

They are often used interchangably but arteriosclerosis is when the arteries become thick and stiff, which results in restricted blood flow to organs and tissues, while atherosclerosis is a specific type of arteriosclerosis, the buildup of fats, cholesteral, etc (plaque) on the arterial walls which causes the lumen to narrow and essentially blocks blood flow.

Explanation:

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."