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.....green plants ultimately. When it first appeared therefore, it would have been seen as a poison, it would have been a pollutant. But gradually, through Darwinian natural selection, living organism

VOA慢速英语2013 EXPLORATIONS - Ancient Martian Conditions Could Have Supported Life

EXPLORATIONS - Ancient Martian Conditions Could Have Supported Life From VOA Learning English, this is EXPLORATIONS, in Special English. Im Kelly Jean Kelly. And Im Christopher Cruise. Today we report on recent scientific findings about the planet Ma

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65 野火的燃烧会造成汞污染 ENVIRONMENT REPORT September 7, 2001: Mercury Pollution in WildfiresBy George Grow （Start at 59

美联社新闻一分钟 AP 2016-4-26

This is AP news minute. 1. President Barack Obama is in Saudi Arabia ahead of the Gulf Cooperation Council summit on Thursday. Obama met with the king of Saudi Arabia after arriving amid strained tensions with the Saudi, over issues with Iran and Syr

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The air thins and they begin to lose the protective weight of the miles of air above them. The pressure is dropping, when you finally get to the stratosphere, and to the altitude we like to work at, it's only one one hundredth that of it's on the gro

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The clues are adding up to give a picture of a distant Martian past, when the planet had a thick atmosphere that was warm enough for water to stream on the surface. But now the waters gone, and the atmosphere is so thin that any water would boil away

英语听力：自然百科 行星旅行指南：木星 Jupiter—8

Picture a suicide dive into the mysterious depth? Relax, Galileo's already done it for you. We separated the probe from the Galileo mother ship. We were flying in toward Jupiter, basically a ballistic bullet. The Galileo probe went in at an unbelieva

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Water on Mars: What Does It Mean? 火星有水意味着什么? For centuries, humans have wondered whether there is life on Mars. Scientists have asked why Mars is losing its atmosphere. Last week, the question was answered with a song. The answer, i

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综合性商港comprehensive commercial seaport春意盎然spring is very much in the air forest coverage森林覆盖率 global warming全球变暖 principal element主要因素 toxic emission废气排放www.examw.com 迸发出心灵的火花ignite t

TED演讲：人类为什么要重返火星

I want to talk about 4.6 billion years of history in 18 minutes. That's 300 million years per minute. Let's start with the first photograph NASA obtained of planet Mars. This is fly-by, Mariner IV. It was taken in 1965. When this picture appeared, th

美国科学60秒 SSS 2013-02-06

Clouds, they are fluffy, white and full of mystery. Although scientist may have better handle on clouds, even they don't know at all. Because the new study can show that atmosphere gases can help clouds form in a way no one had ever considered. That'

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Well,no one could survive without water.But you see pollution has been making more and more water unable for drinking. Yeah.Water pollution has for a long time been a major concern among the environmental issues. But what are the sources of water pol

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To make sure Kepler's truely found a planet, scientists are using one of the largest earth-based telescopes for conformation. This telescope will also determine the planet's mass and distance from its star. Scientists are most interested in the small

英语听力：自然百科 神奇水世界 Water-4

Let's look first. The fresh water that we depend on begins its life in the oceans. As the sun's rays beat down on the surface of the sea, they heat the water molecules until some evaporate. It's the start of an extraordinary journey. Here with water

英语听力：探索发现 科学新发现：我们的大气层-9

We were left with this atmosphere made of molten rock and vaporous rock. It took millions of years for that atmosphere to fall out and to be replaced by an atmosphere made up of nitrogen and carbon dioxide and water vapour. These new gases came from

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In the four decades since our robots first arrived, the once fuzzy ball at the end of our telescopes has steadily focused into a red planet we can understand, and it is not a welcoming place. The problem is the atmosphere is so thin and cold that wat

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EXPLORATIONS - Venus Express Spacecraft Explores Earth's Mysterious Sister PlanetBy Mario Ritter and Daniel Kirch Broadcast: Wednesday, May 10, 2006 (MUSIC) VOICE ONE: I'm Steve Ember. VOICE TWO: And

VOA标准英语10月-Snow Falling From Martian Atmosphere

The U.S. space agency NASA's Mars probe Phoenix has detected icy snow falling through the Martian atmosphere. The spacecraft has also discovered material in the planet's soil that is leading scientists a step closer in their conclusion that life pro

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Fine, captain, but now we come to a genuine difficulty. You're able to lie flush with the surface of the ocean, that I understand. 对，船长，可是这里有实际的困难。这样，您可以使船面跟洋面一致，我可以理解。 But low

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Airplane Contrails Have you ever seen a perfectly cloudless sky? Cloudlessthat isexcept for two or three long white lines smeared across the perfect blue sky by airplanes like smudges on a pane of glass. Why do airplanes sometimes leave contrails beh