NASA’s ambitious plan to save Earth from a super-volcano Question: Which threat would super-volcano pose on human civilization? Answer: The greatest threat that super-volcano may pose on humans is thought to be starvation. With long volcanic winter, it may prevent civilization from being supplied with enough food. 1. Magma: a hot liquid rock which found just below the earth surface 岩浆 Chamber 岩浆房
2. geyser n /ˈɡiː.zər/ a hole in the ground from which hot water comes out 间歇性喷泉3. Asteroid n one of the large rocks which circle the sun 小行星
4. Comet ：an object that moves around the sun, usually at a great distance from it, that is seen on rare occasions from the earth as a bright line in the sky 彗星
5. threshold n a level or point from which you experience sth or sth satrts to happen 阈yu值；临界点
6. aqueduct n：a structure for carrying water across land, especially one like a high bridge with many arches that carries pipes or a canal across a valley（尤指跨越山谷的多拱的）高架渠，渡槽7.geothermal adj. With or concerned the heat in the earth 地热的 a geothermal power plant 地热发电站
8.Fracture v if something hard, like a bone fractures or is fractured, it breaks or cracks （使）（骨头等硬物）破裂，（使）断裂，（使）折断 ： Two of her ribs were fractured when she was thrown from her horse. A fractured pipe at a steelworks has leaked 20 tons of oil into the Severn estuary.一家钢铁厂的管道断裂，致使20吨油泄漏，流入塞文河口。
9.volatile adj /ˈvɒl.ə.taɪl/ likely to change suddenly or unexpectedly or easily become angry and violent 不稳定的；易变的；易怒的，喜怒无常的战争时期食品和燃料的价格极易波动。Food and fuel are volatile in war situation. He had a volatile temper and couldn’t be easy to live with. 他的脾气十分暴躁，别人很难与他相处。A volatile liquid or solid are easy to change into gas （液体或固体）易挥发的，易气化的10 instigate v to cause an event or situation to happen by make a set of actions or a formal process begins 促使发生；发起政府将采取新措施打击恐怖主义。The government will instigate new measures to combat terrorism.
