Unit 5 Into the Unknown Starting out 课件-2023-2024学年高二英语外研版（2019）选择性必修第四册

新外研选择性必修Book 4 Starting out P49 Unit 5 Into the unknown In this lesson, students will: understand the introduction of mysteries by comprehending the video about four natural phenomena; analyze and summarize four unsolved mysteries; fully activate learning schema about “the unknown”. Learning objectives Pre-viewing Some natural phenomena are really amazing. What natural phenomena are you familiar with? the earthquake the mirage the solar eclipse thunder and lightning What more do you know about them? While-viewing What natural phenomena are mentioned? How were these explained in the past? What are the scientific explanations behind them? 此处已嵌入课本视频: Unit 5 Starting Out Ancient Mysteries. the earth-quake Native Americans used to believe that earthquakes were caused by a struggle between a large bird, called the Thunderbird, and a whale. An ancient Japanese belief was that earthquakes were caused by the movements of a giant catfish that carried the world on its back. Scientists now know that earthquakes are actually caused by the movement of tectonic plates. the solar eclipse In many cultures, there were ancient beliefs that solar eclipses were caused by a creature eating the Sun. In Vietnam, that creature was a giant frog, in Norway, a wolf, and in China, it was a huge dog. In fact, solar eclipses happen when the Moon passes between Earth and the Sun, temporarily blocking the Sun’s light. thunder and lightning In Medieval Europe, people thought that supernatural forces caused thunder and lightning. It was a sign of bad times ahead. Modern science tells us that lightning is an electric charge moving between clouds, or between clouds and the earth. Thunder is a shock wave of sound caused by lightning. the mirage In Ancient China, people believed that this was actually caused by the breath of a dragon. These days, people know that a “mirage” happens when layers of air with varying temperatures cause light to bend. What do you know about these mysteries? What other unsolved mysteries do you know of? Which of these do you most want to investigate? After-viewing Atlantis 亚特兰蒂斯（传说沉没于大西洋的岛屿） Atlantis is a legendary city, which is described in the work of the Greek philosopher Plato. The story of Atlantis with its fabulously wealthy and advanced civilisation which was swept into the sea to be lost for ever has captured the imagination of readers for over two millennia. 千周年纪念日 惊人地 Nazca lines 纳斯卡线：位于秘鲁纳斯卡沙漠的一组巨大地面线条和图案，由古代纳斯卡文明创作，通常被认为具有宗教或天文意义。 The Nazca Lines are a collection of giant geometric patterns and animal shapes. Drawn Into the landscapes of southern Peru, the majority of the lines are believed to be the work of the Nazca people around 1AD to 700. Designated a UNESCO World Heritage Site in 1994, numerous studies and theories have so far not explained the reason why the lines were created. 几何图案 Tunguska event 通古斯大事件 Tunguska event, enormous explosion that is estimated to have occurred at 7: 14 a.m. plus or minus one minute on 30 June 1908, at an altitude of 5-10 kilometres, flattening some 2,000 square kilometres and charring more than 100 square kilometres of pine forest near thle Podkamennaya Tunguska River in Central Siberia, Russia. 压扁 烧焦 Black hole 黑洞 A black hole is a region of space-time exhibiting gravitational acceleration so strong that nothing, not even light, can escape from it. 显示重力加速度 Thank you! Lavf52.84.0 $$