What do you know about the sea Everyone knows that the sea looks beautiful when the sun is shining on it. But it becomes very terrible(可怕的) when there is a strong wind. If you study the map of the world, you’ll learn that about three quarters of the world is the sea.
The sea is very deep. In some places, the sea is much deeper. The highest mountain in the world is about 9 kilo-metres high while the deepest(最深的) place of the sea is about 11 kilo-metres deep.
The sea can be very cold. At the top of the sea the water may be warm. But ff you go down, it becomes colder and colder. In most places of the sea, there are lots of fishes and ’plants. Some live near the top of the tea. Others live deep down. But in some places of the sea, no fishes can live at all. ______ of the world is covered by water.