2009年10-11月阅读寂静整理（截至11/18 01:00-The end-Thanks all）

bayern2001

给楼主提个建议。如果你时间充裕的话，可以问下考过的大牛比如740分以上的，确认下阅读的答案。

larry0812

今天刚刚考完，非常感谢阅读寂静，我考的四篇全部来自寂静，分别是地球水的起源（短文章），Halo effect(长文章），Physical difference(长文章) 和雕像（长文章），寂静中已经非常详细，请大家认真看！再次感谢！

ms1398

这是我第一次在CD上发表言论。明天我就要考试了，这几天一直在网上看机经学习如何去考试，自己本身复习的不是很好模考prep两次都只有540 550分 都快绝望了，现在看了一段时间的机经应该会好的吧。当明天的考试结束我会回来回报cd的  谢谢有你们这样一群默默付出的人给了我们这些失意者一线机会！  感谢你们的心情劳动 谢谢你们！ 好人一定会一生平安的！ 恩 真的谢谢你们  就看我明天的考试分数了。。不知道会是怎样。

ms1398

你今天考了多少分？ 方便告诉我吗？

wildeyes

支持楼主的辛勤工作！

便衣警察

太有用了，谢谢

zhangwenteng

Hot Spot That Spawned Hawaii Was on the Move, Study Finds

http://news.nationalgeographic.com/news/2003/08/0814_030814_hotspot.html

zhangwenteng

Liquid center: Mercury has a molten core, radar reveals.
Mercury is hot stuff. That's the conclusion of a new radar study demonstrating that the core of the solar system's innermost planet is at least partially molten. The finding settles a long-simmering debate about the least studied of the planets. It may also provide insight about how the solar system solar system, the sun and the surrounding planets, natural satellites, dwarf planets, asteroids, meteoroids, and comets that are bound by its gravity. The sun is by far the most massive part of the solar system, containing almost 99.9% of the system's total mass.  created its planets.

With Mercury averaging just a third as far from the sun as Earth is, it might seem clear-cut that Mercury's core would be molten. But sunlight has a negligible effect compared with the heat left over from the planet's formation. And considering Mercury's small size, only 40 percent the diameter of Earth, astronomers calculate that the planet ought to have cooled and solidified long ago.

That thinking was challenged in 1974, when the Mariner 10 spacecraft found that Mercury has a magnetic field. The magnetic field of a rocky planet--such as Earth--is usually generated by the sloshing of charged material within a liquid core. It's also possible, however, that the magnetic field is a remnant in the crust, frozen in place when Mercury's core solidified.


In the new research, Jean-Luc Margot Jean-Luc Margot is an astronomer and an AssistantProfessor at Cornell University. He is originally from Belgium. He specializes in planetary sciences. He was awarded the H. C. Urey Prize by the American Astronomical Society in 2004. The asteroid 9531 Jean-Luc is named after him.  of Cornell University Cornell University, mainly at Ithaca, N.Y.; with land-grant, state, and private support; coeducational; chartered 1865, opened 1868. It was named for Ezra Cornell, who donated $500,000 and a tract of land. With the help of state senator Andrew D. , Stan Peale of the University of California, Santa BarbaraHistory
The predecessor to UCSB, Santa Barbara State College, focused on teacher training, industrial arts, home economics, and foreign languages. Intense lobbying by an interest group in the City of Santa Barbara led by Thomas Storke and Pearl Chase persuaded the State  and their colleagues bounced radio wavesRadio waves
Electromagnetic energy of the frequency range corresponding to that used in radio communications, usually 10,000 cycles per second to 300 billion cycles per second. off Mercury's surface to measure small variations in its spin.

Peale had proposed 3 decades ago that a close study of Mercury's spin could determine whether the planet has fluid in its core. Mercury completes three rotations about its spin axis for every two 88-day revolutions around the sun. In that lockstep lock?step  
n.
1. A way of marching in which the marchers follow each other as closely as possible.

2. A standardized procedure that is closely, often mindlessly followed.

Noun 1.  configuration, the sun's gravity causes the spin of the slightly out-of-round planet to vary. Solar gravity has a greater effect on a planet's spin if the core is at least partially liquid.

After 6 years of recording radar echoes from Mercury back to Earth, the researchers found that variations in the spin were about double what would be expected if Mercury were solid.

The most likely explanation is that, at minimum, the outer core of Mercury--the boundary between the heart of the planet and its overlying overlying

suffocation of piglets by the sow. The piglets may be weak from illness or malnutrition, the sow may be clumsy or ill, the pen may be inadequate in size or poorly designed so that piglets cannot escape.  mantle--must be liquid, Margot, Peale, and their collaborators report in the May 4 Science.

"It is clear that Mercury is not solid throughout" comments planetary scientist David Stevenson David Stevenson may refer to:
of the California Institute of Technology California Institute of Technology, at Pasadena, Calif.; originally for men, became coeducational in 1970; founded 1891 as Throop Polytechnic Institute; called Throop College of Technology, 1913–20.  in Pasadena.

Scientists propose that Mercury remains molten because sulfur infiltrated the planet's iron core and lowered its melting temperature.

But at the distance from the sun where Mercury formed, the high temperature would have kept sulfur as a vapor and so prevented it from being incorporated into the planet. That suggests that Mercury, and perhaps other planets, grabbed sulfur and other material from beyond their immediate surroundings, Margot says.

To provide further information about the planet's core, scientists are now looking to NASA's MESSENGER spacecraft, which will settle into orbit around Mercury in 2011, and a Japanese-European mission scheduled to arrive at the planet in 2019.
COPYRIGHT 2007 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2007, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

zhangwenteng

http://www.thefreelibrary.com/Liquid+center:+Mercury+has+a+molten+core,+radar+reveals.-a0163264059

XYXB

你今天考了多少分？ 方便告诉我吗？

-- by 会员 ms1398 (2009/11/5 22:03:55)

你指我吗？我没有考试啊，昨晚有点感冒，所以没有及时更新，抱歉