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.

【高考英语同步练习《Unit 1 School life》周末自主测评(一) 译林版必修1】相关文章：

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（2）模块1 《Unit 2 Heroes》（含解析） 北师大版必修1

★ 四川省2016届高考英语一轮复习课时作业（24） Module 6 Unexplained Mysteries of the Natural World 外研版必修4

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（21）模块7 《Unit 21 Human Biology》（含解析） 北师大版必修1

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（16）模块6 《Unit 16 Stories》（含解析） 北师大版必修1

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（14）模块5 《Unit 14 Careers》（含解析） 北师大版必修1

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（13）模块5 《Unit 13 People》（含解析） 北师大版必修1

★ 【浙江专用】2014届高考英语一轮复习课时作业(二十)必修4Unit 5《Theme parks》

★ 【三维设计】2017版（江苏专用）二轮复习练习：选修8 Unit 3《The world of colours and light》课时跟踪检测B卷（含解析）

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（19）模块7 《Unit 19 Language》（含解析） 北师大版必修1

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（15）模块5 《Unit 15 Learning》（含解析） 北师大版必修1