23、What do we know about the sea? We know that it looks very beautiful when the sun is shining on it. We also learn that it can be very terrible when there is a strong wind. What _ _ 21 _ _ things do we know about it?
The first thing to remember is that the sea is very big. Look at the map of the world, there is _ _ 22 _ _ sea than land. The sea covers three quarters of the world.
Some parts of the sea _ _ 23 _ _ very shallow. But some places are very deep. There is one place near Japan. It is nearly 11 kilometers deep. The _ _ 24 _ _ mountain in the world is about 9 kilometers high. If we put the mountain into the sea at that place, there would be 2 kilometers of water above it!
The sea is salty. There is one sea called the Dead Sea. It is very salty. It is _ _ 25 _ _ salty that swimmers cannot sink! Fish cannot live in the Dead Sea.