什么是怀俄明
美国西部落矶山区一州。为美国第九大州。全州大部地方属落矶山区,平均海拔2,040公尺,高度居全国第二,仅次於科罗拉多。甘尼特峰海拔4,207公尺,是全州最高峰。东部属大平原区,西部边境地区,特别是黄石公园地区经常发生地震,多温泉和间歇泉。大陆分水岭从西北角的黄石湖沿着马德雷山向东南蜿蜒,通过南部边界进入科罗拉多州。黄石湖是该州最大湖泊,位於黄石公园内。本州为北美四大水系--科罗拉多河、哥伦比亚河、密苏里河和大盐湖--的源头供水,对该州最重要的是密苏里水系,它灌溉怀俄明州将近3/4的土地。1743年西班牙和法国探险家先後到达。1868年建立怀俄明地区。1890年7月10日加入联邦,成为美国第四十四州。本州主要经济来源有采矿业、农业、旅游、制造业和森林工业。该州是主要的产煤州之一,铀、石油、天然气的储量均丰。农业以畜牧业为主。山区林地是大量木材工业的基础。旅游业发达。黄石公园建於1872年,每年吸引大量的游客。面积253,324平方公里。首府夏延。人口约493,782(2000)。
Wyoming
State (pop., 1997 est.: 480,000), western U.S. It covers an area of 97,809 sq mi (253,326 sq km); its capital is Cheyenne. It contains part of the Great Plains and the Black Hills. Its ranges of the Rocky Mtns. include the Bighorn, Tetons, and Wind River. Wyoming's highest point is Gannett Peak, at 13,804 ft (4,207 m) tall. The Continental Divide crosses it northwest to southeast. About three-fourths of its rivers drain eastward into the Missouri-Mississippi system. Its largest lake is Yellowstone Lake. Wyoming was already inhabited by Plains Indians, including the Shoshone, when it was first visited by white explorers during the 18th century. The Oregon and Overland trails crossed it. Most of the area was acquired by the U.S. from France in the Lewis and Clark Expedition did not cross the area, a member of the group, John Colter, spent time there. It was included in several U.S. territories before the organization of Wyoming Territory in 1868. It adopted women's suffrage in 1869 and in 1889 was the first state to include that right in its constitution. In the years preceding statehood, it developed a thriving cattle industry. It was admitted to the Union in 1890 as the 44th state. In 1925, it elected the first U.S. woman governor, Nellie Tayloe Ross. Though livestock is still important to its modern economy, mining is increasingly influential, and tourism is growing.
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什么是月岩和月壤
从月球采回的岩石和表土样品大致分为3类:(1)结晶质火成岩,细粒多孔状(颗粒直径<1毫米)至中粒等粒状(颗粒直径>1毫米)岩石,主要由岩浆结晶形成,少数是晶质化的冲击熔岩(见陨石坑)。(2)角砾岩,显微角砾状岩石。碎屑直径约0.1~1.0厘米。由火成岩碎屑、矿物碎屑、玻璃质和月壤机械混...
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什么是毛霉科
毛霉目中最大、最重要的1科。孢囊梗自菌丝上发生,简单不分枝至分枝多次,单生或成束。在孢囊梗或其分枝的顶端形成孢子囊,全部为大型孢子囊,孢子囊内一般都有发达的囊轴。少数的属在孢子囊下面还有孢囊下泡或楔形的囊托。孢子囊成熟时消解或破裂,释放出孢囊孢子。本...
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什么是ÓêÑàÄ¿
Äñ¸ÙµÄ1ĿСÐÍÅÊÇÝ¡£×ìÐζÌÀ«¶øƽ±â£¬»òϸ³¤³É¹Ü×´£»Á½³á¼â³¤£»Î²´ó¶¼³Ê²æ×´£»õÆÛ•¶Ì£¬´ó¶¼±»Óð£¬×ã´ó¶à³ÊÇ°ÖºÐÍ¡£´ÆÐÛÏàËÆ¡£±¾Ä...
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什么是蛇岛蝮
蛇目蝰科蝮亚科蝮属的1种。仅见于中国辽宁省的蛇岛。估计现存2万条。全长可达800毫米(见图)。体型粗壮,头略呈三角形,有颊窝,眼后斜向口角有一细窄的黑褐色眉纹,其下缘镶有一极细的灰白色线纹;躯尾背面灰褐色,有一列暗褐色的“X“形斑。躯干中段背鳞23行,腹鳞150~164,尾下...