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 巖漿 Chamber 巖漿房

2. geyser n /?ɡi?.z?r/? a hole in the ground from which hot water comes out 間歇性噴泉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 閾yu值；臨界點(diǎn)

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?zé)岬?a geothermal power plant 地?zé)岚l(fā)電站

8.Fracture v if something hard, like a bone fractures or is fractured, it breaks or cracks （使）（骨頭等硬物）破裂，（使）斷裂，（使）折斷 ： 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.一家鋼鐵廠的管道斷裂，致使20噸油泄漏，流入塞文河口。

9.volatile adj? /?v?l.?.ta?l/ likely to change suddenly or unexpectedly or easily become angry and violent 不穩(wěn)定的；易變的；易怒的，喜怒無常的戰(zhàn)爭時(shí)期食品和燃料的價(jià)格極易波動(dòng)。Food and fuel are volatile in war situation. He had a volatile temper and couldn’t be easy to live with. 他的脾氣十分暴躁，別人很難與他相處。A volatile liquid or solid are easy to change into gas （液體或固體）易揮發(fā)的，易氣化的10 instigate v to cause an event or situation to happen by make a set of actions or a formal process begins 促使發(fā)生；發(fā)起政府將采取新措施打擊恐怖主義。The government will instigate new measures to combat terrorism.