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课件网) 英语沪教版八年级上册 Focusing on culture of memory The secret Unit 7 Learning objectives 读懂关于“树的记忆”的文章，提取关键信息。 01 了解树木年轮的科学意义及其在历史、气候研究中的应用。 02 通过本课时的学习，学生能够： 重点 Do you think nature is able to remember past events If yes, how Think and say Human beings have the ability to remember the past. Let’s explore. 1. What can you see I can see tree trunks. Look and say 2. What do you think these circles inside the tree trunk are They are tree rings. What do the tree rings show Look and match first year growth rainy season dry season scar from forest fire first year growth rainy season dry season scar from forest fire Read and answer What is the main idea of the article What are tree rings, and why are they called the “memories of trees”. How do tree rings help us understand the past How can scientists tell the age of a tree by looking at its tree rings What do wide tree rings show What do narrow tree rings mean What does a black area on a tree ring mean Read and answer 1. What is the main idea of the article 2. What are tree rings, and why are they called the “memories of trees” 3. How do tree rings help us understand the past Tree rings can tell us things about the past. Tree rings are the circles inside a tree trunk. Each year a tree grows, there is a new ring. The writer calls them the “memories of trees” because they contain information about the past. For example, they are a record of natural events and climate in the past. Scientists can look at tree rings and learn about past climate change and natural disasters such as forest fires. They can also use tree rings to learn about human history. For example, scientists can study old wood and find out when the tree was cut down. They can also use it to to tell the age of old buildings. Read and answer 4. How can scientists tell the age of a tree by looking at its tree rings 5. What do wide tree rings show 6. What do narrow tree rings mean Scientists can tell the age of a tree by counting the rings inside the tree trunk. A wide tree ring shows that the tree grew well that year. This happens when the tree gets enough sun and rain. A narrow tree ring means that the tree did not grow as much that year. This can happen when a tree doesn’t get enough water. 7. What does a black area on a tree ring mean A black area on a tree ring usually means there was a forest fire. Scientists can count the rings from the black area to determine when the fire happened. Read and complete Read the text carefully complete the mind map. are a record of climate change provide information about natural disasters help us understand human history Scientists study the ring patterns to learn about climate change in a place. Scientists look at tree rings to study natural disasters. Scientists use tree ring patterns to find the age of old buildings. Read and answer 1. What is the name of the science th ... ...
