The second starts at 200 metres and goes down to about 1,000 metres.Some sunlight can reach this level,but it is not enough for plants to grow.Because this zone is relatively dark,many of the creatures that live here are able to make light with their body.The light from these animals makes the water look like a sky with moving stars in it.
The third zone is dark.This place,about 3,000 metres deep,may not seem a likely habitat(栖息地),but there are more creatures here than one might think.Most of the animals that live here are black or red because of the lack of light.At this depth,a slow shower of what looks like snow is falling.This phenomenon,called“marine snow”,is actually nutrients falling towards the bottom of the ocean.It is a source of food for the creatures that live in the deep.
Below 4,000 metres,the temperature is near freezing and there is no light at all.In fact,the zone is so dark and empty that scientists named this zone after the Greek word for“no bottom”.There is not much life to be found in this cold and unpleasant part.But some creatures manage to survive here despite high water pressure.
The very deepest part of the ocean is 2,000 metres further down.At this depth,the water pressure is extremely high and life is very difficult for the few creatures that live here.Compared to the other zones,this one has very little life.Since there is no light here,some animals don't have eyes.When scientists explored the very deepest parts of the ocean,they did not expect to find any life at all.It turned out that there are creatures as far down as 10,000 metres.They usually survive by living close to deep sea vents,“chimneys”that send out gases from within the earth.
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