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We are relatively "new" to the Earth yet how come our impact to the Earth System has been profound?
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- Why can Earth, in many ways, be considered amicrobial planet?Historically, how has the origin of life on earth been explained?the landmark experiment by Miller and Urey, and various repeats of this experiment, did not successfully recreate life itself, but why do we consider the results from this experiment as support for the origin of life on Earth?
- Which specific theories (provide the name of the theory and its definition) challenge Archbishop James Ussher's belief that the earth was created on October 22, 4004 BC at 9 pm? Why do we study Ussher when his date of the earth has been shown to be wrong by a large amount of evidence?What evidence would you look for on one of these moons that would tell you that life may have existed on it in the past?For how long has there been life on Earth? For what percentage of time has life existed on Earth? For about how many years of geological time have human existed on earth?
- What was the composition of the earth’s atmosphere at the time of the origin of life, and how did it differ from the atmosphere of today?What is the most accepted hypothesis on the origin of life on earth? How does it compare to the other main hypotheses?Various greenhouse gases cause lines in absorption spectra, which greenhouse gases are the easiest to look for in the atmospheres of exoplanets and why? What could you look for changing "over time" that might indicate a technological civilization on an exoplanet?