Integrating skills

Chemical Structure 1H 2 O=2H + O The water molecule is made up of two Hydrogen atoms and one Oxygen atom. The way the water molecule is formed gives water unique properties. The Chemical Structure of water makes it different from almost everything else on earth.

How much do you know about them? Is the economy there well-developed or not? How much do you know about them? Is the economy there well-developed or not? Which city is the most developed? Which city is the most developed? Why? Why?

Can you tell what map it is? Where is it? Is the water here salty or fresh? What’s the place where river and the ocean meet?

River Ocean Estuary Estuary An estuary is the body of water where a river meets the ocean.

This mixing creates a unique environment. Fresh water and salt water mixed together. Home of thousands of animals and plants. Many cities and towns are built nearby.

Nature ’ s nursery: Estuaries

Find the definition of an estuary An 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.

Nature’s nursery nursery :place where young children are cared, usually while their parents are at work Estuaries are great places for nature’s young ones. Estuaries are the nursery for life in the oceans and rivers.

Activity 1 Activity 1 Finding Topic Sentences Topic Sentence of Paragraph _____ As the oceans are the source of life on earth, the estuaries are our planet's nurseries. Topic Sentence of Paragraph _____ Estuaries are great places for nature's young ones. Topic Sentence of Paragraph _____ Estuaries are also important because they absorb nutrients and pollutants from water coming from inland sources, thus cleaning our water. Topic Sentence of Paragraph _____ Estuaries provide both recreation and education for human beings

Activity 2. Activity 2. Structure of the passage √

Great places for nature ’ s young animals. Clean our water by absorbing nutrients and pollutants from water absorbing nutrients and pollutants from water coming from inland sources; coming from inland sources; Provide both recreation and education for human beings. education for human beings. What kinds of function of estuaries have been mentioned in the passage?

Recreation Education

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. Activity 3 Read the passage and answer the following questions.

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. 2. What does density mean in this passage? It means the number of species per area. It means the number of species per area. 3. How do you think estuaries affect the water that passes through them? They absorb nutrients and pollutants from water coming inland sources, thus cleaning our water.

5. Why are estuaries important to human beings? ① 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. ② Estuaries also contribute to the economy through tourism and fishing.

Why do the young ones like to come and live here ? Which of the following is not true? A. They can get nutrients both from the land and the ocean. B. Because the climate here is warmer. C. Because estuaries are protected by islands,mud and sand. D. Tides provide energy for the ecosystem.

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. 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. Finish the following passage with words from the text. formed mixes createsfilled

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. variety habitat absorbing recreation

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