Inside the petals are five little yellow dust-spikes, and in the centre of the flower is the green vessel with a hooked top, which contains the young seeds.
So, if you image what the rainbow looks like, the reason a plant looks green is because it's not using all the green light – it actually reflects a lot of that back.
But with the water being crystal clear, it's assumed the ocean would be lacking in phytoplankton since that's a large aspect of what makes the ocean either blue or green.
Today you learned that Uranus and Neptune are ice giants, with small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue.
The wildfire oozed slowly toward the lip of the jar when Tyrion tilted it to peer inside. The color would be a murky green, he knew, but the poor light made that impossible to confirm. " Thick, " he observed.