发布网友 发布时间:2022-05-18 23:07
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热心网友 时间:2023-11-18 13:31
全世界约有2000多座死火山、500多座活火山。火山形形色色,各有特点。有的会喷金吐银,喷水,喷泥浆,喷冰块,喷蒸汽,喷毒气等等。
意大利西西里岛的埃特纳火山有史以来曾爆发了500多次,是从未中断的有规律性的活火山。火山爆发停止时,火山口还终年冒着浓烟,晚上可以清楚地看到烟云上回照的熊熊火光。活火山的奇景吸引着千万游客前去观光。法国科学家最近探查出这座火山每天约喷出2000克的金子和9000克的银子,但目前还无法收集。
哈萨克东部的缅布拉克山谷有个喷水的火山,它喷发出来的不是熔岩和蒸汽,而是冰冷的水。因此,科学家叫它喷水火山。火山口直径1000多米,深50米。火山口周围长满了各种植物。为什么火山会喷水呢?原来,北部的天山山脉高山冰川融化的冰水,流到这一带松散的砾石里积聚,由于上面粘土层的挤压而喷出地面。喷水时,水中夹杂泥沙一起喷出,顶端形成一个半球形,十分壮观。在大西洋岛国巴巴多斯东部5000米深处,法国科学家借助电视屏幕发现了一座泥火山,海底有一个宽约1000米的椭圆形火山口,里面翻滚着泥浆和气泡。
冰岛是个冰与火的国土。全岛有300多座火山,至今还有30多座活火山在此起彼伏地喷发着,也常常发生地震;有大量的温泉,水温很高,热气弥漫。冰岛有1/8的土地为冰川覆盖,冰与火结合,使冰岛更加瑰丽神奇。冰川、雪峰多簇拥在火山口附近,一边是火山爆发,一边是冰天雪地,火山在冰川下突然爆发,顷刻将冰层融化,引起山洪突发,洪水泛滥。冰雪之水泻进火山口,形成湖泊。冰雪消融,形成飞泉瀑布。
冰岛南部的格里斯维特火山爆发,喷出的全是冰块,持续了两周,每秒钟大约喷出420立方米的冰块。这一次总共喷出了大约1.3立方千米体积的冰块。原来,这座火山喷出的气体把地面上的冰川冰块,接二连三地抛到空中,它们来不及融化就降落到地面上来,形成火山喷冰的奇观。
夏威夷群岛的火山,每次喷发时散逸出的有害气体特别多,一股难闻的硫磺味,还有水银蒸汽。附近的人们呼吸困难,家里的银器突然变黑,岛上的野兽惊慌乱跑,有的家畜呆若木鸡,沿海大量的浮游生物和小鱼死去。
世界上最大的火山:(美国夏威夷)冒纳罗亚火山
最高的死火山:(南美洲)阿空加瓜山
世界上最大的火山区:(冰岛)蓝湖
最大的火山口:(日本)阿苏山
参考资料:埃特纳火山
热心网友 时间:2023-11-18 13:31
地球上最高的火山及死火山:阿空加瓜山(海拔6,960米,是西、南半球最高峰)位于阿根廷境内热心网友 时间:2023-11-18 13:32
Chinese Spring Festival is the biggest festival in China, and is the most popular traditional festivals. Spring Festival is known as the "Chinese New Year"; Official New Year; is the day before the Spring Festival from the beginning. New Year's Eve this day, people must "shou ye" which means the whole family should stay together and eat a sumptuous dinner. On the New Year's Eve, Chinese will making mplings, setting off firecrackers, paste couplets… to usher the New Year’s arrival.Spring Festival starts on the first new moon of the Chinese calendar between January21 and February 19. The New Year celebration ends fifteen days later on the day of the full moon. The Chinese Spring Festival has been a very old celebration, but in history, not as the Spring Festival period. However, no matter what will be the time to celebrate Chinese Spring Festival, the traditional Chinese New Year has been the same of joy, such as with the family, harmony, and the bright hope for the future.In the morning of spring festival, people get up very early. Everyone should be setting off firecrackers, eating mplings. Children should wear new clothes to keep up with the New Year. At this time, the people will give some "New Year's money" to the children, and wish them all the best of new-one-year-old. When Chinese meet each other they will say the blessings, for instance, happy New Year, Kung Hei Fat ChoyChinese New Year greetings are the most interesting part of the Spring Festival. People will come up to visit their friends and family, the owner will host a dinner banquet. After the guests leave, the host will present a red envelope (New Year's money) to the guests’ children. The children who follow their parents will always receive a lot of red envelopes. 答案补充