Lesson 62 The sea
Step1 presentation
Now look at this globe. It stands for the earth we live on. Now please take a close look at the globe, you will find most part of the globe is blue. Why is that? (Talk about oceans on the earth: the Atlantic Ocean: the Pacific Ocean: the Indian Ocean. Then tell the students we also have the Arctic Ocean)
Step 2 reading
1) How does seawater stay clean? (Seed weeds can produce various chemicals that help keep the seawater clean)
2) Where is the longest coral bed in the world? (The longest coral bed kin the world lies off the northeast coast of Australia)
More questions:
1) The earth looks blue from the space because it is so far away (false. 6the earth looks blue form the space because two thirds of the earth’s surface is made up of vast oceans)
2) Only a few people have seen much of the earth’s solid surface before (false. Since much of the earth’s solid surface lies below the sea, little of it has been seen by humans)
3) Altogether there are eleven minerals that make up the salt water of the oceans (false. Altogether there are 12 minerals that make up the salt water of the oceans, including salt)
4) Chemicals produced by seaweeds help keep the seawater clean
5) The surface water of the Mediterranean in summer can reach up to 25 degree or even 29 degree because the weather is very hot
6) According to the passage, if the sea loses a lot of water to the air, there might be fewer [arts of salt per thousand of water (false. Take the Mediterranean for example, there are between 37 and 39 parts of salt per thousand parts of water as the sea loses a lot of water to the air)
7) Coral beds can be seen everywhere in the sea all over the world (false. Coral beds can be found where the sea is not deep and the water temperature must not fall below 20 degree)
8) Corals must live in clean water and dirty water will kill them
Read “salt lakes of the world”
1) What is the most famous salt lake in the world and where is it? (The most famous salt lake in the world is the Dead Sea and it is in the Middle East)
2) Why does the lake become so salty? (The lake becomes so salty because water is lost into the air as a result of the heat of the sun, and the salt stays in the lake)
3) Which is the saltiest lake in the world? (The saltiest lake in the world is the Great Salt Lake in the USA)
4) Can you give an example to show how salty the Dead Sea is? (The water of the Dead Sea contains about 250 parts of salt to every thousand parts of water, and it is difficult to swim or dive, as your body always floats on the surface)
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