标签：sediment 相关文章
But even if there had been water, life doesn't start overnight. Even a simple microbe is the product of complex chemical systems that take millions of years to evolve. Had the water lasted long enough
火星生命
Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried u
火星生命
Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea-surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land. The open sea was deep and mys
新概念英语第四册
IN THE NEWS - Remembering the Gulf Oil Spill, One Year Later This is IN THE NEWS in VOA Special English. 这里是美国之音慢速英语新闻报道。 Last year on April twentieth the Deepwater Horizon oil drilling rig exploded in flames in the Gu
2011年VOA慢速英语(四)月
浮游生物粪渣助科学家预测气候变化 Scientists trying to predict future changes in our climate are using every possible source of data to make their calculations. Lately, they have learned that one of the most sensitive instruments could
VOA双语新闻 2015年10月
Early farming began in the Near East about 10500 years ago. Farming first reached Balkans in Europe some 8 to 9 thousand years ago and then crept westward. Locals in Britain seperated from mainland by the relatively newly formed English Channal did n
2015年Scientific American(二)月
The divers started in the ocean, but they are now within solid bedrock, 150 feet beneath someone's living room. They are now swimming in the water supply for the town above. Here they find, as they had hoped, life in the pitch darkness. These are hyd
自然百科2009年
The landscape of modern Utah scarcely resembles the landscape of 156 million years ago, when Allosaurus ruled supreme, there were fewer mountains. 现代犹他州的地形跟一亿五千六百万年前大相径庭，在异特龙称霸之时，那里没
侏罗纪搏击俱乐部
As scientists delve deeper beneath the oceans surface, they find bizarre creatures that have adapted to harsh and extreme environments. Now comes a new onethe discovery of the first multicellular animals that survive and reproduce entirely without ox
60秒科学
New Details of Sunken Treasure Ship Released New details about a 300-year-old sunken treasure ship were released this week with permission from groups involved in the search effort, including Colombias government. The wreck of the Spanish ship San Jo
2018年VOA慢速英语(五)月
By Rosanne Skirble Coral reefs are home to the greatest diversity of plant and animal life found in any habitat, anywhere on the earth. But, while they are found in 101 countries and territories, the
VOA2004（下）--健康科技
Mars Rover Finds Evidence of Ancient Sea David McAlary The U.S. space agency NASA says Mars once had a shallow, salty sea that could have supported life. The evidence has come from chemical and physic
VOA2004（上）--各类新闻
第三讲：判断词汇和短语的意义题（一） 命题规律 含有指示代词的句中，常有被考查词汇或短语。 具体环境中，具有指代上下文语义功能的词汇尤其是名
实用英语
Microbe organize live in you ，on you ,in soil in clouds ,and below the ocean floor ,that last bags of single self.. is particularhard to study, not only the samples are difficult to obtain ,but they can easily be contaminated with all that other mi
2015年Scientific American(八)月
Australia's worst dust storm in 70 years blanketed the countrys east coast Wednesday in a cloud of red outback grit. The reddish pall swept into the cities of Sydney and Brisbane overnight, bringing an eerie orange dawn to Sydney. The color was amazi
自然百科2009年
These huge tracks of rainforest close to the Queensland coast are essential because they regulate the flow of water and the sediment it contains. Thats important, because theres an awful lot of water here. Hot humid tropical air gives rise to vast am
自然百科2014年
Why is this diver burrowing into the bottom of this mini lake? She is literally disappearing into the sand and gravel of the waters floor, only debris and the occasional bubbles from her breathing tank are visible. She is part of the project, largely
自然百科2010年
Back in Los Angeles, Luiss team are working on the bones that were dug up in Utah. The next step in turning them into an exhibition is to work out exactly what they are. And this is where the fossil bones end up, and here the preparateurs continue th
探索与发现2012年
Why Didn't Earth Freeze Completely? Research published in the July 2 issue of Nature reveals one reason our planet didn't succumb to an enveloping ice sheet during glacial ages. Christie Nicholson reports. [The following is an exact transcript of th
60秒科学
淡水FRESHWATER 淡水资源Freshwaterresources 谈水保护Conservationoffreshwater 水坝Dams 冰Ice 湖泊Lakes 自然排水系统Naturaldrainagesystems 河流流域开发Riverbasindevelopment 河流
英文语法词汇