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Topic: Planet Earth

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	Earth - Wikipedia, the free encyclopedia
		From Earth the main apparent motion of celestial bodies in the sky (except meteors which are within the atmosphere and low-orbiting satellites) is the movement to the west at a rate of 15 °/h = 15'/min, i.e., a Sun or Moon diameter every two minutes.
		In Norse mythology, the Earth goddess Jord was the mother of Thor and the daughter of Annar.
		Since Earth is rather large, it is not immediately obvious to the naked eye viewing from the surface that it is an oblate spheroid, bulging slightly at the equator and slightly flattened at the poles.
	en.wikipedia.org /wiki/Earth (2677 words)

	Earth
		The Earth is 4.5 to 4.6 billion years old, but the oldest known rocks are about 4 billion years old and rocks older than 3 billion years are rare.
		Earth is the only planet on which water can exist in liquid form on the surface (though there may be liquid ethane or methane on Titan's surface and liquid water beneath the surface of Europa).
		There was probably a very much larger amount of carbon dioxide in the Earth's atmosphere when the Earth was first formed, but it has since been almost all incorporated into carbonate rocks and to a lesser extent dissolved into the oceans and consumed by living plants.
	www.nineplanets.org /earth.html (1590 words)

	StarChild: The planet Earth
		Earth is the only inner planet in our solar system that has liquid water on its surface.
		Earth's amazing gaseous atmosphere is responsible for making life possible on this, the third planet from the Sun.
		Earth rotates on an imaginary axis which is tilted at a 23.5 degree angle.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level2/earth.html (404 words)

	Earth \| The Blue Planet \| Solar System \| Earth Facts (Site not responding. Last check: 2007-10-07)
		Earth is the only planet we know of in our solar system that humans can live on.
		Earth is the only planet where water can exist in liquid form on the surface.
		Earth is the fifth largest planet and the third planet from the Sun.
	www.kidzworld.com /site/p582.htm (243 words)

	Earth Introduction
		Earth is the 3rd planet from the Sun at a distance of about 150 million kilometers (93.2 million miles).
		Earth is the only planet in the solar system known to harbor life.
		The Earth and Moon were imaged by Mariner 10 from 2.6 million kilometers while completing the first ever Earth-Moon encounter by a spacecraft capable of returning high resolution digital color image data.
	www.solarviews.com /eng/earth.htm (1599 words)

	Savage Earth: Restless Planet
		If you imagine the Earth as a giant bell, it's ringing with earthquakes every second of the day -- from the many imperceptible clinks of microquakes to the deafening gong of very occasional but "great" earthquakes (those of magnitude 8.0 or greater).
		Most earthquakes happen near the boundaries of tectonic plates, both where the plates spread apart and where they crunch or grind together (although large temblors also strike from time to time in the normally stable interior of continents).
		Though some scientists dream of discovering warning signals that would allow the evacuation of a city just before a large earthquake, the focus of earthquake preparation today is on making sure that buildings and other structures are engineered to withstand the maximum likely shaking without collapsing completely.
	www.pbs.org /wnet/savageearth/earthquakes (1193 words)

	StarChild: The planet Earth
		Seventy percent of the Earth's surface is covered by water.
		Earth is the third closest planet to the Sun.
		The Earth's axis is not straight up and down, but tilted a little bit.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level1/earth.html (186 words)

	Earth
		Earth is the third planet from the Sun and the fifth largest:
		In Roman Mythology, the goddess of the Earth was
		The Earth's atmosphere is 77% nitrogen, 21% oxygen, with traces of argon, carbon dioxide and water.
	seds.lpl.arizona.edu /nineplanets/nineplanets/earth.html (1590 words)

	THE EARTH - ENCHANTED LEARNING SOFTWARE
		The Earth is closest to the Sun (this is called perihelion) around January 2 each year (91.4 million miles = 147.1 million km); it is farthest away from the Sun (this is called aphelion) around July 2 each year (94.8 million miles = 152.6 million km).
		The Earth's axis is tilted from perpendicular to the plane of the ecliptic by 23.45°.
		The Earth's atmosphere is a thin layer of gases that surrounds the Earth.
	www.enchantedlearning.com /subjects/astronomy/planets/earth (929 words)

	CNN.com - Earth-like planet discovered 50 light-years away - Aug 26, 2004
		And a trio of roughly Earth-sized planets was found in 2002 to orbit a dense stellar corpse known as a neutron star.
		At 14 times the mass of Earth, the newfound planet -- circling a star similar in size and brightness to our sun -- is about as heavy as Uranus, a world of gas and ice and the smallest giant planet in our solar system.
		In a telephone interview, Boss of the Carnegie Institution said the European's analysis of the data represents a "reasonable argument." He said the planet had to form inside the orbit of the larger planet in the system, which orbits the star about twice as far as Earth is from the sun.
	www.cnn.com /2004/TECH/space/08/26/new.planet (952 words)

	BBC News \| SCI/TECH \| Planet Earth on the move (Site not responding. Last check: 2007-10-07)
		Using the well-understood "gravitational sling shot" technique that has been employed to send space probes to the outer planets, the researchers now think a large asteroid could be used to reposition the Earth to maintain a benign global climate.
		To expand the Earth's orbit around the Sun at a rate that compensates for the increasing brightness of the star would require an asteroid encounter every 6,000 years, or about every 240 generations.
		Earth's gradual outward migration may require adjustments to be made to the orbits of other planets as well.
	news.bbc.co.uk /hi/english/sci/tech/newsid_1154000/1154784.stm (640 words)

	Planet Earth, Earth Sciences for Society
		The extent to which Earth's systems impinge on our daily lives and, in turn, to which our activities to interfere with those delicately balanced systems is a matter of global concern.
		To focus on the positive aspects of this relationship, and demonstrate how geoscientists are the key players in creating a sustainable future for humans and their planet, IUGS is to proclaim an International Year of Planet Earth.
		Governments will be urged to pay greater attention to the Earth sciences as affecting many aspects of the everyday lives of their citizens, with particular reference to applications in educational systems, governmental legislation and civil regulations, so as to take full advantage of this extensive source of expertise and experience.
	www.esfs.org (570 words)

	Earth
		Earth, our home planet, is a beautiful blue and white ball when seen from space.
		The third planet from the Sun, it is the largest of the inner planets.
		Earth is the only planet known to support life and to have liquid water at the surface.
	www.windows.ucar.edu /tour/link=/earth/earth.html (89 words)

	Mars Global Surveyor MOC2-368 Release
		In addition, a fortuitous alignment of Earth and Jupiter---the first planetary conjunction viewed from another planet---permitted the MOC to acquire an image of both of these bodies and their larger satellites.
		Because Earth and the Moon are closer to the Sun than Mars, they exhibit phases, just as the Moon, Venus, and Mercury do when viewed from Earth.
		The larger two, Callisto and Ganymede, are roughly the size of the planet Mercury; the smallest, Io and Europa, are approximately the size of Earth's Moon.
	www.msss.com /mars_images/moc/2003/05/22 (868 words)

	APOD: August 19, 1996 - Welcome to Planet Earth (Site not responding. Last check: 2007-10-07)
		The planet has a relatively thin atmosphere composed mostly of nitrogen and oxygen.
		Earth has a single large Moon which is about 1/4 of its diameter and, from the planet's surface, is seen to have almost exactly the same angular size as the Sun.
		With its abundance of liquid water, Earth supports a large variety of life forms, including potentially intelligent species such as dolphins and humans.
	antwrp.gsfc.nasa.gov /apod/ap960819.html (138 words)

	PLANETPALS earth fast facts list world wonders
		Earth moves around the sun in a circular type path.
		It is the only planet known to support life, although some of the other planets have atmospheres and contain water.
		Notice that Water in the form of the oceans, covers approximately 70% of the earth's surface, and land the remaining 30%.
	www.planetpals.com /planet.html (215 words)

	Earth (Site not responding. Last check: 2007-10-07)
		The Earth is a complex planet to render.
		The planet is shrouded by layers of complex clouds with varying opacities.
		This map is a synthesis between my original earth map, gradient mapping of the USGS DEM information, hand painting, DEM modulation of detail, bathyspheric depth information, and the USGS Ocean clip.
	gw.marketingden.com /planets/earth.html (336 words)

	Resource: Planet Earth
		Plate tectonics, one of the most important discoveries of the 20th century, is explored at such sites as the erupting Kilauea volcano and the bottom of the Atlantic Ocean in the submersible craft Alvin.
		Perhaps the last great unexplored frontier on earth, the oceans reveal major new revelations as detected by scientists aboard the space shuttle and submerged to the depths of the "middle ocean" to view rare life forms.
		By examining the earth's mineral and energy sources, scientists analyze how the theory of plate tectonics has revolutionized the search for earth's treasures that lie hidden in locations such as the Red Sea and Antarctic ice cap.
	www.learner.org /resources/series49.html (353 words)

	Earth and Moon Viewer
		In addition to the Earth, you can also view the Moon from the Earth, Sun, night side, above named formations on the lunar surface.
		The Earth and Moon Viewer would have been enormously more difficult to implement without the help of the software and imagery mentioned in the credits.
		Home Planet, Earth screen saver, Sky screen saver, Moontool, Craters screen saver, and an Excel catalogue of the Palomar Observatory Sky Survey.
	www.fourmilab.ch /earthview/vplanet.html (335 words)

	Is Earth the Only One? Planets WebQuest
		Put the correct number of the orbit pattern that belongs to each planet in the box under the planet's name.
		Click on each planet to find out what your age would be on that planet.
		Find out what your weight would be on each planet by using the math formula on sheet that you printed, "How To Calculate Your Weight on Another Planet" Find out the gravity of each planet by looking at the Planet Date Survey sheet you printed out at the beginning.
	its.guilford.k12.nc.us /webquests/planets/planets.htm (660 words)

	CyberHunt: Extreme Planet Earth
		The Sahara Desert in the country of _____________ is the HOTTEST place on Earth.
		The Atacama Desert in ______________ is the DRIEST place on earth.
		The DEEPEST point on earth, the Marianas Trench, is located more than 35,000 feet down at the bottom of the ____________ Ocean, just east of ______________________.
	teacher.scholastic.com /products/instructor/planetearth.htm (375 words)

	Earth Observatory Newsroom: Blue Marble Next Generation
		In celebration of the deployment of its Earth Observing System, NASA is pleased to share the newest in its series of stunning Earth images, affectionately named the “Blue Marble.”; This new Earth imagery enhances the Blue Marble legacy by providing a detailed look at an entire year in the life of our planet.
		From a computer processing standpoint, the major improvement is the development of a new technique for allowing the computer to automatically recognize and remove cloud-contaminated or otherwise bad data—a process that was previously done manually.
		The Blue Marble: Next Generation is a series of images that show the color of the Earth’s surface for each month of 2004 at very high resolution (500 meters/pixel) at a global scale.
	earthobservatory.nasa.gov /Newsroom/BlueMarble (1012 words)

	Home Planet Release 3.1
		Earth maps can be customised and extended by editing a DLL which provides maps to Home Planet.
		View Earth From panel allows you to view a texture-mapped image of the Earth as seen from the Sun, Moon, a selected Earth satellite, above the observing location, or the antisolar point.
		A screen saver which displays the the Earth map with day and night regions and the current position and phase of the Moon like Home Planet's main Map window is available.
	www.fourmilab.ch /homeplanet/homeplanet.html (1988 words)

	Earth Today - Exhibition Home Page (Site not responding. Last check: 2007-10-07)
		This web site provides a quick look at the information presented in the Earth Today exhibit as well as links to many of the near real-time data sets used to study the Earth.
		We are now able to look at the Earth as a whole, and observe how its atmosphere, oceans, landmasses, and life interact as global systems.
		Earth's atmosphere, hydrosphere, geosphere, and biosphere are dynamic, changing on timescales of days, minutes, or even seconds.
	www.nasm.si.edu /earthtoday/dynam.htm (132 words)

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