The sea
What do you 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 other things do we know about it?
The first thing to remember is that the sea is very big. When you look at the map of the world you will find there is more water than land. The sea covers three quarters of the world.
The sea is also very deep in some places. It is not deep everywhere. Some parts of the sea are very shallow. But in some places the depth of the sea is very great. 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 place!
If you have swum in the sea, you know that it is salty. You can taste the salt. Rivers, which flow into the sea, carry salt from the land into the sea. Some parts of the sea are more salty 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!
In most parts of the sea, there are plenty of fishes and plants. Some live near the top of the sea. Others live deep down. There are also millions of tiny living things that float in the sea. These floating things are so small that it is hard to see them. Many fish live by eating these.
The sea can be very cold. Divers, who go deep down in the sea, know this. One the top the water may be warm. When the diver goes downwards, the sea becomes colder and colder. Another thing happens. When the diver goes deeper, the water above presses down on him. It squeezes him. Then the diver has to ware clothes made of metal. But he cannot go very deep. Some people who wanted to go very deep used a very strong diving ship! They went down to the deepest part of the sea in it .they went down to a depth of eleven kilometres!
课件35张PPT。 Unit 3 Under the seaStep1 Warming UpWhat do you know about the sea? Discuss it with your
partners and then share your points. The followings are
some tips for you.The size
The water
The depth
The temperature
The plants and the animals under the seaThe Pacific OceanThe Arctic OceanThe Atlantic OceanThe Indian OceanAsianNorth AmericaAfricaEuropeSouth AmericaAntarcticTalk about the mapOceaniaIs coral a plant?No. It’s not a plant but a variety of animal life of different shapes and bright colours.Warming Up1. Have you seen plants and animals that live under the sea?
2. Where did you see them?
3. Do you have any favourite sea plants or animals? Share what you know about these plants and animals.4. Find out from your classmates where they have seen them.
Use the list below to help you:
on a snorkelling trip
at an aquarium on a boat tour
on TV nature programmes
in books in films on the Internet 2.ThinkingWhat does the sea bring to us ?It also brings us Fairy tales.MermaidsWhat are they?Different kinds of whales:What will happen?Step 2 Fast readingWhat is the passage mainly about?
How did the whalers know the information about a whale?The passage is mainly about how the killer whales helped the
whalers catch the huge whales and protected the whalers. The killer whale threw itself out of the water and then crashed
down again. The whalers knew it told them there was a whale
out there for them.Step 3 Reading for detailsRead the text again and try to finish the exercise
from 3-6 at page35 of Best English.HomeworkRead the text again after class and answer the questions
of Exercise 1 at page 21 of the textbook.
Thank you for attending the class.
