高中英语 Unit5《The Power of nature》学案3 新人教版选修6

Unit 5 The Power of Nature知识网络图语言探究类别新课标要求掌握的项目话题Talk about natural diasters重点单词Diaster; bored; boring; bore; effort; volcano; volcanologist; volcanology;consider; bore; risk; vary; warn; absolute;reserve;crystal; swallowguarantee; erupt; impressive重点短语burn to the ground; make ones way; be enthusiastic (about); make an effort to do sth; at risk;give birth to; compare with; take sb. by surprise; unfortunately; amazed; fantastic重点句型1. Have you ever considered how weak humans are compared with a volcano, hurricane or earthquake?2. Sometimes working indoors, Im never bored.3. Many houses have been covered with lava or burnt to the ground.4. We slowly made our way to the edge of the crater.5. Today, I am just as enthusiastic about my job as the day I first started.6. She made an effort to be nice to her boss.7. Having collected and evaluated the information, I help other scientists to predict where lava from the volcano will flow next and how fast it will flow.语法V-ing 形式作状语作文write a composition on natural disasters.学能目标Learn some information about natural disasters.Know how to use ing form as adveribal.技能目标Learn about the usage of ing form as adveribal.自主探究About 100 years ago,people worldwide began burning more coal and oil for homes, factories, and transportation. Burning these fossil fuels reeases carbon dioxide and other greenhouse gases into the atmosphere. These added greenhouses gasses have caused Earth to warm more quickly than it has in the past.How much warming has happened? Scientists from around the world tell us that during the past 100 years, the average global air temperature has risen more than 0.6C(1.0F). This may not sound like very much change, but even one degree can affect the Earth. Below are some effects of climate change that we see happening now. Sea level is rising. During the 20th century, sea level rose 10-20 cm (4-8 inches) due to melting glacier ice and expansion of warmer seawater. In the next 100 years, sea level may rise as much as 85 cm (33 inches). This is a threat to people living near the coast, wetlands, and coral reefs. Arctic sea ice is melting. The summer thickness of Arctic icebergs is about half of what it was 50 years ago. This melting ice may someday cause changes in the worlds ocean currents. Sea-surface temperatures are warming. Some animals, such as corals, cannot live in warmer seas. Over the past few decades, about a quarter of the worlds coral reefs have died. Heavier rainfall causes flooding in many regions as warmer temperatures speed up the water cycle. In the last ten years, floods have caused more damage than in the previous 30 years. There have been changes in where we can farm: As climates warm, some mid-latitude places, like Europe, are getting a longer growing season, while some tropical places are becoming too hot and dry to grow crops. The amount of drought may be increasing. Higher temperatures lead to a high rate of evaporation and very dry conditions in some areas of the world. Researchers are not sure if drought has increased as a result of current warming. Ecosystems are changing. As temperatures warm, species may migrate