The hormone that induces ovulation in women and promotes the ovarian secretion of progesterone is

luteinizing hormone (the 'LH surge')

Explanation:

this LH surge causes the dominant follicle to rupture and release the mature egg from the ovary.

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."