Tell me some sites where can i get engg science fair projects or models ( earth sciences and remotesensing)?

for free

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  • 9 years ago
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    This just one i picked out for u, full instructions at the site below, if you dont like this one go to the second link.

    Do you know the cause of the last ice age? Do you know why the last ice age started and why it ended? This question puzzled scientists in the nineteenth century, and many of them put a lot of effort into figuring it out. In 1824, Joseph Fourier, the famous French mathematician and physicist, discovered that gases in the atmosphere might affect the surface temperature of Earth. He called this the greenhouse effect. Fourier reasoned that energy, in the form of visible light from the Sun, can easily penetrate the atmosphere to reach the surface of Earth and heat it up, but heat can't easily escape back into space. Our atmosphere absorbs the heat coming from Earth, called infrared radiation, and radiates some of it back to Earth. This is why we are warm, instead of a lifeless and frigid planet.

    In the mid-nineteenth century, John Tyndall was also trying to figure out what started and ended the ice age. In the course of his investigation, he looked into which gases in the atmosphere could trap heat. He found that water vapor and carbon dioxide (CO2), two components of the atmosphere, could trap heat. In fact, even though there are only a few parts in 10,000 of CO2 in the atmosphere, even a trace amount can affect how much heat the atmosphere radiates.

    At the end of the nineteenth century, a Swedish scientist, Svante Arrhenius, performed a complicated calculation that showed that cutting the amount of CO2 in the atmosphere could lower the temperature by 4–5 degrees. That would be sufficient to cause an ice age. At the time of the last ice age, geochemical events may have caused variations in the amount of CO2 in the atmosphere. According to Arvid Hogbom, a friend of Arrhenius', human activity at the end of the nineteenth century was adding CO2 to the atmosphere at about the same rate as geochemical processes. Arrhenius predicted that at that rate, there would be global warming in a few centuries. He didn't realize that humans would continue to increase their rate of CO2 production. Being too warm didn't bother Arrehenius because he lived in chilly Sweden!

    The study of climatology and the effects of excess CO2 are very complicated. Just as water moves through the water cycle on Earth, CO2 moves through the carbon cycle. Carbon dioxide cycles in water, vegetation, air, soils and living creatures. How all of these carbon cycles interact can help in finding a possible answer to global warming. In this science fair project, build a model of Earth, a simple greenhouse, and investigate how heat is trapped in the model and how the temperature varies. You will compare the temperature inside and outside the model Earth at different times of the day. See for yourself how the greenhouse effect works!

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