高中二年级英语(人教版)下册 Unit 13 Integrating Skills 2

　　LIFE IN THE OCEAN

　　The earth's oceans can reach depths of up to 11,000 metres. That is deep enough to cover Mt Qomolangma! The oceans are incredibly large and contain several different habitats. To make it easier to describe the various parts of the oceans, marine scientists usually divide the oceans into five zones. Each zone is different mainly as a result of how much sunlight reaches it.

　　Most of the life in the ocean can be found in the first zone, which begins at the surface and goes down about 200 metres. Because there is sunlight at this level, plants are able to grow. Marine animals such as dolphins, sharks, sea turtles and sea lions, and of course a variety of fish, live in the sunlit part of the ocean. It is difficult to hide from other animals in this area, but many species have adapted by becoming dark on the top and light on the bottom. This makes it difficult to see them against the dark water below and the blue sky above.

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