Unit7 Section 4 Focusing on culture课件 2026-2027学年沪教版英语八年级上册

U7 Focusing on culture The Secret of Tree Rings 1 Do you believe in “the time machine”? 时光机 If there were a time machine, which secret card would you like to explore(探索)? A B C Mr. Tree from 1000 years ago... Mr. Tree from 1000 years ago... Mr. Tree from 1000 years ago... Mr Tree itself is a time machine, do you know why? Because it really has memory, and he can tell you by his...? growth rings tree rings Do trees have ________(memory)? memories Why some rings are wide? This is a good sign as it means the tree grew well and was healthy. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place. Why some rings are wide? For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen?” and “How common are forest fires?” natural disaster 1 Read the article about tree rings to learn what they can tell us. The memories of trees Do trees have memories? This may seem like a strange question, but trees can actually tell us things about the past. When a tree is cut down, you can see something special inside: rings. These rings are the memories of trees. Tree rings contain lots of secrets from the forest. Every year the tree grows, there is a new ring. Scientists can count the rings to tell the age of the tree. They also study tree rings to learn about the climate and the environment. Tree rings are a record of the climate. Some rings are quite wide. This is a good sign as it means the tree grew well and was healthy. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place. Scientists also look at tree rings to study natural disasters. For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen?” and “How common are forest fires?” Tree rings can also help us understand human history. For example, scientists can use tree ring patterns to learn the age of old buildings. Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down. Thanks to this new method, a team of archaeologists discovered that a Viking village in Canada was built in the year 1021 CE. It’s amazing that trees can tell us so much, even though they cannot talk! Read carefully and answer the questions. 1.How do scientists tell the age of a tree? By counting the tree rings. 2.What does a wide tree ring mean? It means the tree grew well and was healthy. Every year the tree grows, there is a new ring. Scientists can count the rings to tell the age of the tree. They also study tree rings to learn about the climate and the environment. Tree rings are a record of the climate. Some rings are quite wide. This is a good sign as it means the tree grew well and was healthy. Scientists also look at tree rings to study natural disasters. For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen?” and “How common are forest fires?” 3.What can a black area on a tree ring usually indicate? It usually means there was a forest fire. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place. 4.What can scientists learn about a particular place by looking at tree ring patterns? They can learn about climate change in that place. 5. How can tree rings help us understand human history? Scientists can use tree ring patterns to learn the age of old buildings and even figure out exactly when the tree was cut down with the new method of looking at the chemistry of each tree ring. Tree rings can also help us understand human history. For example, scientists can use tree ring patterns to learn the age of old buildings. Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down. Thanks to this new method, a team of archaeologists discovered that a Viking village in Canada was built in the year 1021 CE. It’s amazing that trees can tell us so much, even though they cannot talk! Do trees have ________(memory)? This may seem like a strange question, ________ trees can actually tell us things ________ the past. When a tree ________________（被砍伐）, you can see something special inside: rings. These rings are the memories of trees. Tree rings contain lots of secrets from the forest. memories but about was cut down some special things have/include Every year the tree grows, there is a new ring. __________（science） can ________(数) the rings to tell the age _____ the tree. They also study tree rings to learn about the climate ______ the environment. Tree rings are ________(一个记录) the climate. Some rings are quite wide. This is a good sign as it means the tree grew ______（good） and was healthy. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change ______ a particular place. Scientists count of and a record of very because well Because of/Owing to in specific Scientists also look at tree rings to study ________(nature) disasters. For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen?” and “How common are forest fires?” natural Tree rings can also help us understand human history. For example, scientists can use tree ring patterns to learn the age of old buildings. Nowadays, they can even look at the ________(chemical) of each tree ring to figure out exactly when the tree was cut down. Thanks to this new method, a team of archaeologists discovered that a Viking village in Canada ________（build）in the year 1021 CE.It’s amazing that trees can tell us so much, even though they cannot talk! At present chemistry was built surprising 3 Find the words and phrases in the article and match them with their meanings (1) contain (line 4) (2) particular (line 12) (3) natural disaster (line 14) (4) chemistry (line 24) (5) figure out (line 24) a used to refer to a specific person or thing b to discover the answer c to have / hold something inside d the chemicals that something is made up of e used to refer to an earthquake, flood, forest fire, etc. 包含 特定的 特定的 自然灾难 化学 弄清楚 化学品 1.cut down 2.tree rings 3.learn about 4.a record of the climate 5.in a particular place 6.natural disasters 7.figure out 8.even though 砍到，减少 树木年轮 了解 气候记录 在一个特定的地方 自然灾害 弄清楚 尽管 Scan the article and underline the phrases, then put them into Chinese 1.cut down 2.tree rings 3.learn about 4.a record of the climate 5.in a particular place 6.natural disasters 7.figure out 8.even though 砍到，减少 树木年轮 了解 气候记录 在一个特定的地方 自然灾害 弄清楚 尽管 Scan the article and underline the phrases, then put them into Chinese 2 Why are tree rings useful? How do scientists make use of them? Complete the mind map below with the information from the article on page 110. are a record of climate change Scientists look at the tree ring patterns to learn about climate change in a particular place. provide information about natural disasters help us understand human history Scientists look at tree rings to study natural disasters. Scientists use ring patterns to learn the age of old buildings. Summarize the article. Though it seems strange, trees can tell us about the past—their "memories" are the inner rings seen when cut down, which hold forest secrets. Each year a tree grows a new ring. Scientists count rings to know the tree’s age, and study them to learn about climate, environment and natural disasters: wide rings mean the tree grew well , narrow rings come from little rain, and a black ring area usually shows a forest fire. Tree rings also help understand human history. Scientists use their patterns to find old buildings’ ages, and now check each ring’s chemistry to know when the tree was cut down—this new method helped archaeologists find a Canadian Viking village was built in 1021 CE. It’s amazing that trees can tell so much without talking. If there were a time machine, which secret card would you like to explore(探索)? Notes Scientists have long studied tree rings. This branch of science is called dendrochronology . Experts in this field use tree rings to learn more about our world. They compare tree rings from different trees in the same area to collect data about the past. 科学家们对树木年轮的研究由来已久。这一学科分支被称为树木年代学。该领域的专家利用树木年轮来更多地了解我们的世界。他们比较来自同一地区不同树木的年轮来收集关于过去的数据。 Q1: Which tree is the best witness? an old pine tree 500 years old in a place far away from humans high up in a mountain very old, but in a single environment, its information might be very poor A Which tree is the best witness? an old oak 150 years old by a river experience many droughts and floods younger, but its climate changes a lot, which will be shown in the tree rings very clearly, especially about natural disaster B Which tree is the best witness? an old ginkgo 100 years old by a countryside then it becomes a town the youngest, not only record something about the nature, but also about human activities. C Which is the best witness? A B C very old, but in a single environment, its information might be very limited younger, but its climate change will be shown clearly,especially about natural disaster the youngest, not only record things about nature, but also about human activities. an old storyteller or a experienced witness? ... ... Over to you Q2: Why does a dark ring grow in spring and summer, and why does a light ring grow in fall? soft and fat dense and solid What can we learn from it? -When in a good condition, grow fast. When in a bad condition, grow steadily Q3: What can you infer from these clues? Physical Clue: A large number of trees in 536 AD show very narrow tree rings. Finding: A world-wide natural disaster may cause a rather dry and poor environment. Document: A world-wide natural disaster was recorded in a history book. If there is a lack of information from the paper, we can trace back to tree rings if the information from the document is different from that of tree rings, which should you trust? What is the tree ring like? A time machine A silent recorder A monitor A diary of the Earth other recorder from the nature... A B C 冰芯样本 岩芯样本 岩芯的英译为“core” ，是根据地质工作或工程的需要，使用岩芯环状钻头及其他取芯工具，从孔内取出的圆柱状岩石样品。 从固体矿产的矿体或矿层中取出的含矿岩石或矿石，则称矿芯 。岩芯是研究和了解地下地质和矿产情况的重要实物材料。 [1] To be a good detective, we need to find clues from documents as well as physical evidence... We can learn a lot from the nature, Let us respect nature, love nature and protect nature! $