Question

Why is deep ocean water generally high in nutrients?

The nutrients come from volcanic vents on the ocean floor.
Nutrients are readily released from sediments on the ocean floor.
There are no living organisms in the deep water to consume the nutrients.
It has spent considerable time at depth and has accumulated falling detritus.

Answer 1

help me pls

Answer 2

Well, it is definitely not c because there are millions of organisms on the ocean floor

Answer 3

Give me a second

Answer 4

I think it is C

The problem with nutrients in the ocean is that they are accumulated in the bodies of living things, and living things are solid, and solid objects tend to sink. A fish carcasse or a plankton carcasse might gloat for a few hours or a few days, but then it sinks. And it sinks straight to the bottom of the ocean, carrying all the nutrients it concentrated in its lifetime with it.

As a result upper level ocean waters tend to become nutrient depleted very quickly. Even if I spray fertiliser on the ocean to increase the nutrient levels I will only get a brief bloom of life, and then it will die… and sink straight to the bottom. Dead things like logs or wildebeest lie around on the surface on the land, and so the nutrient they accumulated can be released by decay and used all over again by other lifeforms. So you get localised nutrient cycling on the land. Living things in the ocean sink, so any nutrient added only lasts a few generations at best, then it is lost. It can’t be locally cycled.

So for an area of ocean to remain productive it needs to have a constant source of nutrients added to replace all those nutrients that are being lost as the sink into the depths. That addition can come from rivers on a very localised scale, but for large scale work those nutrients can only come from one place, and that is the same place they escaped to in the first place: the nutrients have to come from the ocean depths.

The only way to drag up nutrients form the ocean depths is to have water rising form the ocean depths, right? Make sense? Water on the equator is already warm, and warm water floats on the surface. You can’t get the cold nutrient rich waters form the depth to the surface if the surface water is already warm. But if the water is colder than the deep ocean water, then the deep water will rise like a bubble, bringing all those nutrients form the depths right to the surface.

This is most apparent in the arctic and antarctic spring. The sudden melt of ice causes the temperature of the liquid ocean to fall, not just because melted ice is cold but because the ice acted as a blanket all winter, and now it’s gone. The ocean surface becomes notably colder than the ocean depths. The surface water cascades down through the ocean like a submarine waterfall, and the deep nutrient rich waters rise like smoke form a fire, bringing nutrients with them. This is accompanied by a massive bloom in algae and is followed by a massive bloom in zooplankton feeding on it. And following the zooplankton come the plankton feeders: the fish, the whales and the seals. The productivity of the arctic and antarctic ocean in spring is as high as anywhere on earth despite the low temperatures. And it supports the largest animals that have ever lived.
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Answer 5

it doesnt made sense because living organims do swim and live in deep waters

Answer 6

I mean D! I am so sorry!

Answer 7

I miss typed