儋州市那大中学 杨卫平制作.pptVIP

* * 儋州市那大中学 杨卫平制作 高二英语课件 Unit 16 lesson62 The Pacific Ocean The Arctic Ocean Asia North America Africa Europe South America Antarctic Oceania 1.How salty is the water in the ocean? √ A. 3.5% C. 25% B. 11% 2.Where is the longest coral bed in the world? It lies off the northeast coast of Australia. 3. How does sea water stay clean? Seaweeds produce various chemicals that keep the sea clean. 4. How much of the earth’s surface is sea? A. 45% B. 56% C. 71% √ The earth looks blue from the space because it is so far away. F 2. Only a few people have seen much of the earth’s solid surface before. F 3. Altogether there are eleven minerals that make up the salt water of the ocean. F 4. Chemicals produced by seaweeds help to keep the seawater clean. T 5.The surface water of the Mediterranean in summer can reach up to 25°C. T 6.According to the passage, if the sea loses a lot of water to the air, there might be parts of salt per thousand of water. F 7.Coral beds can be seen everywhere in the sea all over the world. F 8.Corals must live in clean water and dirty water will kill them. T How salty are different lakes and seas? Great Salt Lake Dead Sea Mediterranean Oceans NAME % 3.5% 3.7—3.9% 25% 27% Something about the Mediterranean. Salt Temperature Width Length 3,700km 1,800km 3.7-3.9 % 25℃-29 ℃ Conditions for coral. water temperature above 20℃ plenty of light clear water water depth of less than 60 meters 2.Where is the saltiest lake in the world? The Great Salt Lake. 1. What is the most famous salt lake in the world? The Dead Sea 3. Why is the lake called The Dead Sea? Because very few things can live in such salty water. Why did the Dead Sea become the saltiest lake in the world? minerals from thousands of natural springs and the River Jordan little rain there no river flowing out of the lake _____from space, the earth looks blue.This is because ____ _____ of the earth’s surface is______ ___ ____