what is the earths membrane???
923009
I suppose this is a metaphor- either the crust or the atmosphere depending on how you look at it.
798933
water as in H2O? just ok...\nyeah covered with it... \nas long as the planet is not made up entirely of water.... that wold be like a big floating water vapor....\nhaha
827581
The Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space. Three-quarters of the atmosphere's mass is contained within the first 11 km of the planet's surface. This lowest layer is called the troposphere. Further up, the atmosphere is usually divided into the stratosphere, mesosphere, and thermosphere. Beyond these, the exosphere thins out into the magnetosphere (where the Earth's magnetic fields interact with the solar wind). An important part of the atmosphere for life on Earth is the ozone layer.\n\nThe atmospheric pressure on the surface of the Earth averages 101.325 kPa, with a scale height of about 6 km. It is 78% nitrogen and 21% oxygen, with trace amounts of other gaseous molecules such as water vapor. The atmosphere protects the Earth's life forms by absorbing ultraviolet solar radiation, moderating temperature, transporting water vapor, and providing useful gases. The atmosphere is one of the principal components in determining weather and climate.\n\nBecause hydrogen gas is light and based on Earth's mean temperature, achieves escape velocity, unfixed hydrogen leaves the Earth. For this reason, the Earth's environment is oxidizing, with consequences for the chemical nature of life which developed on the planet.\n\nYou could get more information from the link below...
845751
What is the Earth made of?\nhttp://www.leo.lehigh.edu/envirosci/geology/penngeo/whatis/whatis.html\n\nChemical Structure of the Earth\nhttp://www.earth.northwestern.edu/people/seth/202/lectures/Minerals/compintro.htm\n\nStructure and composition of the Earth\nhttp://www.amonline.net.au/geoscience/earth/structure.htm\n\nThe way we know what makes the earth, chemically speaking is to test for it.  Such as the composition of the atmosphere is put through a mass spectrometer (http://answers.yahoo.com/question/index?qid=20060905084043AAQ20dx) this tells scientist exactly what elements are in the test sample and in what percent!  We do the same for tests in the earth, of course there are abundant other tests to perform, both chemical and by hand, to tell us a more rounded story of the formation of the earth's history.
1105908
Earth????  They are really "Earth glasses" (as you can tell that is who the sun is looking at)
1029070
Chloroplast not only have a membrane but they have two an outer and inner. I would go with ribosomes. Everything else has a cell membrane.\nWell this is if you consider the question to ask if the organelle itself has a membrane or the cell in which the orgnelle is contained has a cell membrane.\nI took Ap Bio 2 years ago but I believe the a plant cell also has a cell membrane even though it has a cell wall. The wall keeps them from bursting when they get too much water through osmosis. An animal cell would burst.
1153936
Earth: \nthe fragmental material composing part of the surface of the globe; especially: cultivable soil; or\nareas of land as distinguished from sea and air; or\nthe planet on which we live that is third in order from the sun.\n\nIt depends how you use it, really...
370797
The Sun.\n\nEDIT: Yes, what other people have said about the Earth's tilt and whatnot are true in that they affect the atmosphere, but you asked for the source of energy. That is solely the Sun.
261896
The earths atmosphere\n\n\nMy first thought was not formal. What I thought when I read your question is that nothing is between heaven and earth that "the heavens" come down and touch the earth.
704586
well you can read this very useful and informative article if you really want  to know about methane:\n\nhttp://www.redorbit.com/news/space/185170/origins_of_methane_on_earth/
19701
Earth's Atmosphere\nThe Earth is surrounded by a blanket of air, which we call the atmosphere. It reaches over 560 kilometers (348 miles) from the surface of the Earth, so we are only able to see what occurs fairly close to the ground. Early attempts at studying the nature of the atmosphere used clues from the weather, the beautiful multi-colored sunsets and sunrises, and the twinkling of stars. With the use of sensitive instruments from space, we are able to get a better view of the functioning of our atmosphere.\n\nLife on Earth is supported by the atmosphere, solar energy, and our planet's magnetic fields. The atmosphere absorbs the energy from the Sun, recycles water and other chemicals, and works with the electrical and magnetic forces to provide a moderate climate. The atmosphere also protects us from high-energy radiation and the frigid vacuum of space.\n\nThe envelope of gas surrounding the Earth changes from the ground up. Four distinct layers have been identified using thermal characteristics (temperature changes), chemical composition, movement, and density\n\nComposition of the Atmosphere\nThe atmosphere is primarily composed of Nitrogen (N2, 78%), Oxygen (O2, 21%), and Argon (Ar, 1%). A myriad of other very influential components are also present which include the water (H2O, 0 - 7%), "greenhouse" gases or Ozone (O, 0 - 0.01%), Carbon Dioxide (CO2, 0.01-0.1%),\n\n\nLayers of atmosphere\n\nThe atmosphere is divided into five layers. It is thickest near the surface and thins out with height until it eventually merges with space. \n\n1) The troposphere is the first layer above the surface and contains half of the Earth's atmosphere. \nThe troposphere is where all weather takes place; it is the region of rising and falling packets of air. The air pressure at the top of the troposphere is only 10% of that at sea level (0.1 atmospheres). There is a thin buffer zone between the troposphere and the next layer called the tropopause\n\n2)The Stratosphere and Ozone Layer\nAbove the troposphere is the stratosphere, where air flow is mostly horizontal. The thin ozone layer in the upper stratosphere has a high concentration of ozone, a particularly reactive form of oxygen. This layer is primarily responsible for absorbing the ultraviolet radiation from the Sun. The formation of this layer is a delicate matter, since only when oxygen is produced in the atmosphere can an ozone layer form and prevent an intense flux of ultraviolet radiation from reaching the surface, where it is quite hazardous to the evolution of life. There is considerable recent concern that manmade flourocarbon compounds may be depleting the ozone layer, with dire future consequences for life on the Earth\nMany jet aircrafts fly in the stratosphere because it is very stable. \n\n3)Mesosphere\nThe mesosphere starts just above the stratosphere and extends to 85 kilometers (53 miles) high. In this region, the temperatures again fall as low as -93 degrees Celsius as you increase in altitude. The chemicals are in an excited state, as they absorb energy from the Sun. The mesopause separates the mesophere from the thermosphere.\n\nThe regions of the stratosphere and the mesosphere, along with the stratopause and mesopause, are called the middle atmosphere by scientists. This area has been closely studied on the ATLAS Spacelab mission series. Meteors or rock fragments burn up in the mesosphere.\n\n4)Thermosphere\nThe thermosphere starts just above the mesosphere and extends to 600 kilometers (372 miles) high. The temperatures go up as you increase in altitude due to the Sun's energy. Temperatures in this region can go as high as 1,727 degrees Celsius. Chemical reactions occur much faster here than on the surface of the Earth. This layer is known as the upper atmosphere.\n\nThe upper and lower layers of the thermosphere will be studied more closely during the Tethered Satellite Mission (TSS-1R).\n\n\n5) exosphere\nThe exosphere starts at the t
449917
Water Systems:\n\nhttp://www.ec.gc.ca/water/images/nature/prop/a2f2e.jpg\n\n95% of Earth's water is Salt Water leaving 5% as Fresh Water.  Nearly all of the Fresh water is in the form of Ice or underground.\n\nThis site appears to have a lot of data as well as activities for learning.\n\nhttp://members.aol.com/bowermanb/water.html
494439
With an orbit of where earth is, 149,600,000 km, that's a surface area of 7.12383E+15 km², i think...\n\nYou can fit approx. 11,700 earths in a single ring around the sun, so you can imagine the amount of materials needed for a dyson sphere is pretty massive! (although Jupiter is more than a 1000 times more massive than the earth!)\n\nI think you might even need to destroy whole solar systems to get the materials required, but the planets, moons & asteriod belt would be a good place to start, assuming you need specific materials like metals especially.\n\nDon't even think about the cost!
331575
The earth travels through space.\nIt supports life.\n\nYou could call it a space ship. Yes.\n\nWelcome aboard Space Ship Earth
621370
What is air?  It is a mixture of gases, trapped in the gravity of the Earth, that form an envelope around our planet.  It is a mixture of nitrogen (~78%), oxygen (~21%), and the rest small amounts of carbon dioxide, water vapor, argon, neon, carbon monoxide, and traces of other gases.\n\nIf there were no nuclei present, there would be no matter present, and that is the definition of a vacuum.
1100454
From an electrical point of view, the earth is just a conductor, like a wire.  If you understand voltage, you would know it is a difference in potential.  It is meaningless to say a point is 3 volts.  It is 3 volts relative to something.  The earth is everywhere and is a conductor, so it is convenient to call that a reference (so it is 0 volts).  It is a misconception that electricity returns to the earth.  It does not; it returns to the source (a circuit is a loop).\n\nNow to confuse things, ground is also a term that is used to mean a reference, without actually meaning the earth.  When you say every wiring diagram or project uses the earth, that isn't true.  If you looked at a schematic of a computer for example, the processor has a connection to a positive DC power supply and to ground.  This isn't the earth.  The board of the computer has a wiring plane that is connected to the positive power and another that is called ground, which is connected to the negative of the power supply.\n\nThe ground in the computer, which has nothing to do with the earth, is probably connected to the ground prong on the electrical plug.  There are 3 connections on that plug, loosely called hot, neutral, and ground.  That ground is for safely, and again that function really has nothing to do with the earth.  That ground is connected to the neutral at the electrical service.  The neutral at the electrical service is connected to the earth, because if it weren't, the actual voltage of your neutral and metal things in your house (via the ground outlet pin), would be unpredictable.\n\nAbout the cow comment.  Cattle and some other animals are very sensitive to small voltages that we cannot sense.  Again, the earth is a conductor.  When current flows through any conductor, it creates a voltage drop dependant on the resistance.  The national electrical code requires bonding (electrical connection with wires) where cattle would be so there won't be voltage for them to feel.  Basically it is wire with lower resistance to carry any current with a much smaller voltage drop.  There are similar requirements for swimming pools and the like, since wet skin is much more sensitive to voltage than dry skin.
1150478
It's widely believed in the scientific community that the earth has a liquid mantle (that's where magma/lava comes from) and a solid super-hot iron core.  Good luck digging through that.