陕西省榆林育才中学高中英语 5.2 The power of nature reading 导学案 1 新人教版选修 6学习目标：1、理解课文内容，了解自然的威力，火山喷发的过程（作者的一份工作）。 2、结合上下文语境，感知、体验、重点句子。 3、让学生对 火山喷发的自然现象有更多的了解。学法指导：1、自主学习课文，完成预习案中的练习。 2 以课文为载体在阅读中充分利用各种读技巧以提高自己的阅读能力。预习案一、话题阅读 Some knowledge about volcanoes(关于火山的一些知识）There are thousands of volcanoes ( 火 山 )all over the world. What makes volcanoes ? What happens?The inside of the earth is very hot. Because it is very, very hot, the rock（岩石） has melted（融化） like ice. It has become liquid（液体）, like water.It is always boiling, like water in a kettle（茶壶）.If you have seen a kettle boiling, you know that the steam（水蒸气） and boiling water try to get out. The very hot melted rock inside the earth also tries to get out. Usually it cannot because the outside of the earth is too thick and strong.But in some places the outside of the earth is thin and weak. Sometimes a crack（裂缝）( a small opening) appears. The hot melted rock,, which we call “lava（岩浆）”, pushes up through the crack and bursts（喷涌） through . Steam and gas shoot up into the air and the hot melted lava pours （倾倒）out. Big pieces of rock may be thrown high into the air.After a while the volcano becomes quiet again. The melted lava becomes hard. Later the same thing happens again and again. Each time more hot lava pours out on top of mountain is built up, with a hole down the middle. Perhaps the volcano will then be quiet and no more lava will burst out. Perhaps it will start again hundreds of years later.Vesuvius （维苏威火山）is the name of a very famous volcano in Italy. It f...
