About Earth

Earth is the third planet from the Sun and is the largest of the terrestrial planets in the Solar System, in both diameter and mass. It is also referred to as the Earth, Planet Earth, Gaia, Terra, and "the World".

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Home to millions of species including humans, Earth is the only place in the universe where life is known to exist.
Scientific evidence indicates that the planet formed 4.54 billion years ago, and life appeared on its surface within a billion years. Since then, Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful radiation, permitting life on land.

Earth's outer surface is divided into several rigid segments, or tectonic plates, that gradually migrate across the surface over periods of many millions of years. About 71% of the surface is covered with salt-water oceans, the remainder consisting of continents and islands; liquid water, necessary for all known life, is not known to exist on any other planet's surface. Earth's interior remains active, with a thick layer of relatively solid mantle, a liquid outer core that generates a magnetic field, and a solid iron inner core.

Earth interacts with other objects in outer space, including the Sun and the Moon. At present, Earth orbits the Sun once for every roughly 366.26 times it rotates about its axis. This length of time is a sidereal year, which is equal to 365.26 solar days. The Earth's axis of rotation is tilted 23.4° away from the perpendicular to its orbital plane, producing seasonal variations on the planet's surface with a period of one tropical year (365.24 solar days). Earth's only known natural satellite, the Moon, which began orbiting it about 4.53 billion years ago, provides ocean tides, stabilizes the axial tilt and gradually slows the planet's rotation. A cometary bombardment during the early history of the planet played a role in the formation of the oceans. Later, asteroid impacts caused significant changes to the surface environment. Long term periodic changes in the Earth's orbit, caused by the gravitational influence of other planets, are believed to have given rise to the ice ages that have intermittently covered significant portions of Earth's surface in glacial sheets."

Quotes about Earth

1. “ We'll be teaching people to be responsible for their own organic waste by converting eggshells and vegetables and coffee grinds into nutritious black earth. ”

   In Wriggling, randy recyclers

2. “ We are able to make a microcosmic universe where you are able to create earth in a little box. ”

   In Batawa sets green example for other communities

3. “ The earth absorbs 50 per cent of the sun's energy. ”

   In Batawa sets green example for other communities

1. Mentioned In 239 Articles

2. Liqui-Force victim of economic downturn

   The Cornwall Standard Freeholder (5 hours, 54 min ago)   About Hivefive , Carbon Tax , Duke Energy , US Utilities Explore Article

   ...tizens to get it really going, to really change things for the betterment of mankind and the planet Earth. Fossil fuels are a finite source of energy and we are now beyond peak oil production in the world.... (Read Full Article)
   

   Comment on Article Mentions:   Cornwall   Earth

3. Mary Ellen Harte and John Harte: The Methane Bomb is Ticking: Here's an Energy Plan to Defuse It

   huffingtonpost.com (17 hours, 42 min ago) Explore Article

   ...ut can we do it? Oh yes, we can. Want more details? Download our book and start reading: www.CoolTheEarth.US With the Obamas' impending move to Washintong DC in January, many have begun to speculate... (Read Full Article)
   

   Comment on Article Mentions:   Earth   Obama   Norwegian

4. Election -- Us Senate race full answers

   Standard Journal Online (Nov 18 2008) Explore Article

   ...bill S.3111 will establish personhood at fertilization. When sperm meets egg, a child of God enters Earth life. The pre-born baby has equal value to the mother in the eyes of God. In the absence of a le... (Read Full Article)
   

   Comment on Article Mentions:   Earth   Congressional   Utah State University

5. New energy technology can boost US economy

   philly.com (Nov 16 2008) Explore Article

   ...ry technologies that use fuel that is free forever - the sun, the wind, and the natural heat of the Earth. What follows is a five-part plan to power the nation with a commitment to producing 100 percent of... (Read Full Article)
   

   Comment on Article Mentions:   Earth   Texas   New York Times

6. Responses to “Professors don’t pull students to the left,” @issue ...

   ajc.com (Nov 15 2008) Explore Article

   ...lar and geothermal energy is about 10000 degrees at the surface of the sun and in the middle of the Earth, and near ambient temperature ... Politics in academia Responses to “Professors don’t pull stud... (Read Full Article)
   

   Comment on Article Mentions:   Earth   George Bush   America

7. Earth Day Network President on EPA Coal Ruling

   newsblaze.com (Nov 14 2008)   About Hivefive , Carbon Tax , Duke Energy , US Utilities Explore Article

   ... the renewable energy industry. Wind, solar, geothermal and other renewable energy ... Statement of Earth Day Network President Kathleen Rogers "EPA's ruling is a nail in the coffin for the future of coal.... (Read Full Article)
   

   Comment on Article Mentions:   Earth   Obama   Earth Day

8. Noted Solar Expert Updates Caltech Associates on Renewable Energy

   openPR.com (Nov 14 2008) Explore Article

   ...ven if adequate supplies were available. Burning fossil fuels raises carbon dioxide (CO2) levels in earth’s atmosphere, contributing to global warming and impacting life on earth. At current rates of CO² production, temperatures could rise about 5-10°F in 30-50 years, possibl... (Read Full Article)
   

   Comment on Article Mentions:   Earth   Associates   Pasadena

9. Popular energy: Solar thermal

   Wicked Local Blog (Nov 13 2008)   About Hivefive , Carbon Tax , Duke Energy , US Utilities Explore Article

   ...re not “geothermal.” Geothermal heat starts a long way below the surface, and it comes from the Earth’s molten mantle. We have not learned how to tap into it yet. The proper term is ground source hea... (Read Full Article)
   

   Comment on Article Mentions:   White House   Washington   Maryland

10. Mantra Ventures Group sees more opportunities in the US with Obama ...

    proactiveinvestors.com (Nov 13 2008) Explore Article

    ...prototype trials. ERC offers an innovative solution to reduce the impact of carbon dioxide (CO2) on Earth's environment by converting CO2 into materials with a broad range of commercial applications, i... (Read Full Article)
    

    Comment on Article Mentions:   Earth   Frankfurt

11. Tuesday, Nov. 18

    Home - The Advocate Weekly Online (Nov 12 2008) Explore Article

    ...ried Treasures of the Taconic and Green Mountains," presented by Ken Nicholson, retired biology and Earth sciences teacher at Arlington Memorial High School, focusing on the plate tectonics and continental... (Read Full Article)
    

    Comment on Article Mentions:   Earth   Williamstown   Center for Ecological Technology

12. A view from the soapbox

    California Aggie // Front Page (Nov 12 2008) Explore Article

    ...rselves of the unimpeachable importance of maintaining our global habitat. First, let's accept that Earth has the last word. Any bump, bust or crash our silly human economies can experience is a passing ir... (Read Full Article)
    

    Comment on Article Mentions:   Earth   America

13. Expo speakers agree, differ

    BismarckTribune.com (Nov 11 2008)   About Hivefive , Carbon Tax , Duke Energy , US Utilities Explore Article

    ...d water beneath the ground are extracted, enhanced geothermal is where holes are drilled into the Earth and water is pumped into the hole, then heated by the Earth’s temperature and pumped out as steam to generate electricity, Reicher said. "This is a very prom... (Read Full Article)
    

    Comment on Article Mentions:   Earth   Bismarck   Google

14. Kenny Ausubel: Dreaming the Future Can Create the Future

    huffingtonpost.com (Nov 10 2008) Explore Article

    ...nd at the threshold of a singular opportunity in the human experiment: To re-imagine how to live on Earth in ways that honor the web of life, each other and future generations. It's a revolution from the h... (Read Full Article)
    

    Comment on Article Mentions:   Midwest   Mediterranean   China

15. The Irish Emigrant

    The Irish Emigrant (Nov 10 2008) Explore Article

    ...tlement. Mr McCullagh received head injuries when the motorcycle on which he was a passenger hit an earthen bank in Ovens, Co. Cork in June 2006. He is permanently in a wheelchair and also has some intelle... (Read Full Article)
    

    Comment on Article Mentions:   Shanghai   Intel   Samoa

16. Ramping Up to the Hydrogen Highway

    The Cutting Edge News (Nov 10 2008) Explore Article

    ... hardware is in place, the energy is inflation proof because it is free. Pretty much every place on Earth has some sort of renewable resource that can be used to make hydrogen. That makes it possible to st... (Read Full Article)
    

    Comment on Article Mentions:   Earth   Japan   Ford Motor Company

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