blue holes.ppt

* Climate change 气候变化 Guideline 指导方针，准则 Perspective [p?spektiv] 观点，看法 Fossil 化石 Analogy [?n?l?d?i]类似，相似 calcite [k?lsait] 方解石 stalagmite [st?l?gma?t]石笋 stalactite[st?l?kta?t]钟乳石 Layer 层，层次 * Read more news after class. 2. Remember the words and phrases of the report. 3. preview unit 14 lesson 2 * Fill in the summary of the report. A blue hole is a flooded sea cave with a hole that opens up at the land’s surface, which gets its name from the color some have when seen from the air. Not all blue holes are blue and some are dark or muddy. Blue holes are the result of erosion and can be found in the ocean or inland. Kenny Broad argues underwater caves are probably one of the least understood ecosystems on the planet for they are one of the least explored and one of the last places where you need to go physically. Information gathered from these blue holes is helping scientists to increase their understanding of biology, archaeology and geology. * * * * * 恶运之钻“希望” The Hope Diamond The Curse of The Hope Diamond * Hope Diamond Adds New Chapter to Its Cursed Legacy With a Modern Setting * Gemstones Sapphire Ruby Topaz emerald Beryl Tourmaline * How gemstones are formed ? * Two ways: One way is when molten rock cools and crystallizes underground. Another way is when preexisting rock is under extraordinary pressure and heat. * * Blue holes * A blue hole is ________________with a hole that _________the lands surface. These cave systems form in carbonate rock, often on islands. Some blue holes __________________ _________and water chemistry. Far below sea level, they contain some of the _________________on Earth, with no oxygen and no light. Yet these areas are filled with life forms that have adapted to ___________________. Information gathered from these blue holes is helping scientists to _____________________of biology, archaeology and geology. But exploring these blue hole environments brings _______________________ a flooded sea cave opens up at