From a plane we can see the fields, cities, mountains or seas below 100 metres. If we go into space, we see more and more of the earth. China launched its self- made “Haiyang-1B” oceanic survey satellite (海洋调查卫星）from the Taiyuan in Shanxi Province at 11:27 a.m. Wednesday, April 11, 2007. And people have learnt more about the sea in the last few years.
The sea is very big. It nearly covers three quarters of the earth. The sea is also very deep in some places. There is one place where the sea is about 11 kilometres deep. However, the highest mountain in the world is about 9 kilometres high. If we put that mountain into the sea at that place, there would be still 2 kilometres of water above it!
In most parts of the sea, there are many kinds of fishes and sharks. Some live near the top of the sea. Others live deep down. There are also a lot of small living things, and lots of fishes live by eating them.
The sea can be very cold. When people go down, the sea becomes colder and colder. Only some men can go down into the deep sea. But in 1970, five women scientists lived in the deep sea for fourteen days.
