Presentation on theme: "Nuture's nursery: estuaries"— Presentation transcript:
1 Nuture's nursery: estuaries Unit 13Integrating SkillsNuture's nursery: estuarieso
2 SkimmingFind the definition of an estuaryAn estuary is the body of water where a river meets the ocean. Salt water from the ocean and fresh water from the river mix together in an estuary. This mixing of fresh and salt water creates a unique environment filled with life of all kinds－a zone between the land and sea.
3 1. the estuaries are our planet's nurseries. Look through the passage and find out what kinds of function or significance of estuaries have been mentioned ? (Topic Sentences )1. the estuaries are our planet's nurseries.2. Great places for nature’s young animals .3. Clean our water by absorbing nutrients andpollutants from water coming from inland sources4. Provide both recreation and education for humanbeings.Insert a map of your country.5.Contribute to the economy through tourism and fishing
5 (1)Why are estuaries such good places for nature’s young one? Reading: Questions(1)Why are estuaries such good places for nature’s young one?(2)What does density mean in this passage?(3)How do estuaries affect the water that passes through them?(4)Why are estuaries more sensitive to pollution than other areas?(5)Why are estuaries important to human beings?Insert a map of your country.
6 1. Why are estuaries such good places for nature’s young ones? Read the passage and answer the following questions.1. Why are estuaries such good places for nature’s young ones?In estuaries, animals can enjoy all the benefits of the oceans without having to face many of its dangers.Tides provide energy for the ecosystems, but estuaries are protected from waves and storms by islands, mud or sand.Nutrients from both the land and the ocean arrive in estuaries.
7 2. What does density mean in this passage? It means the number of species per area.3. How do you estuaries affect the water that passes through them?They absorb nutrients and pollutants from water coming inland sources, thus cleaning our water.4. Why are estuaries more sensitive to pollution than other areas?Because estuaries act as filters(过滤器), many pollutants end up in them.
8 5. Why are estuaries important to human beings? Estuaries provide both recreation and education for human beings.People can fish, swim and have fun on the beach.Scientists and students have endless opportunities to study a variety of life in the habitat.Estuaries also contribute to the economy through tourism and fishing.
10 Finish the following passage with words from the text. Estuaries are bodies of water along coasts that are ________ (形成) when fresh water from rivers flows into and ________ with salt water from the ocean. In estuaries, the fresh river water is blocked from streaming into the open ocean by either surrounding mainland, or islands. This mixing of fresh and salt water _______ a unique environment ______ with life of all kinds — a zone between the land and sea known as an estuary.formedmixescreatesfilled
11 variety habitat absorbing entertainment The estuary gathers and holds a ________ of life－giving nutrients from the land and from the ocean, forming an ecosystem that contains more creatures than any other ________ on the earth. Estuaries are also important for human beings. They protect water quality by ________ pollutants from water coming from inland sources. They are centers for ________________ (娱乐) and education. Estuaries, in short, are treasures.varietyhabitatabsorbingentertainment
13 Topic: ________________ What will happen to a piece of metal if you put it in water?Topic: ________________Step 1:Step 2:Step 3:Describe what happensDescribe the causes and effectsThe conclusion
14 Sample writing: If a piece of metal,or any other object is put in water ,it will dissolve. Becausethe water molecule is made up of one oxygenand two hydrogen atoms. It is polar,that is,it has a slightly negative and a slightly positiveend. The two ends make it possible for waterto break down both solids and gases. Soa piece of metal will dissolve when it is put inwater .
16 Tip 1 You should explain each step in the order it happens. If you are describing a process,You should explain each step in the order it happens.Tell the readers about the causes and effects and use words like first, second, then, etc to show the order of the steps.First…Second…Third/ Then…Last…
17 Tip 2 What is it ? How many parts is it made up of? If you are writing about something that has several parts, describe each part and explain its function and structure.The following questions may help:What is it ? How many parts is it made up of?What‘s the structure of each part? How does it work?What’s the function of the thing?
19 Dear editor,Nowadays in our city, more and more people own cars. I think there are good reasons for owning a car. First, with a car a person can get around freely, without spending a lot of time. Second, a car is comfortable to travel in. Finally, it is safer to drive a car than a bicycle.However, I am afraid more and more cars will cause air pollution. What’s more, more and more traffic jams and accidents are happening every day.Personally, I hope the government should control the number of cars to let us have a clean and quiet environment.YoursLi li