What do we know about the sea? We know that it looks very pretty when the sun is shining on it. We also know that it can be very rough when there is a strong wind. What else do we know about it?
The first thing to remember is that the sea is very big. If you look at the map of the Earth, you will find there is more water than land. The sea covers about three quarters of the Earth.
The sea is also verydeepin some places. It is not deep everywhere. Some parts of the sea are very shallow (浅的). But in some places the sea is very deep. There is one spot, near Japan, where the sea is nearly 11 kilometres deep! The highest mountain in the world is about 9 kilometres high. If that mountain were put into the sea at that place, there would be 2 kilometres of water above it! What a deep spot!
If you swim in the sea. you know that it is salty. You can taste the water. Rivers, which flow into the sea. carry salt from the land into the sea. Some parts of the sea are saltier than other parts. There is one sea. called the Dead Sea. which is very salty. It is so salty that swimmers cannot sink! Fish cannot live in the Dead Sea!
