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Life on this Paradoxical Planet

Life on this Paradoxical Planet. A summary of Earth’s common elements. Spheres . Lithosphere – Hydrosphere – Atmosphere – Biosphere – Which elements are most common in each of these? . Which elements are found where on Earth? . Questions about our Paradoxical Planet .

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Life on this Paradoxical Planet

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  1. Life on this Paradoxical Planet A summary of Earth’s common elements

  2. Spheres • Lithosphere – • Hydrosphere – • Atmosphere – • Biosphere – Which elements are most common in each of these?

  3. Which elements are found where on Earth?

  4. Questions about our Paradoxical Planet • Where is O most commonly found in Earth? • Why is O so important – why not S? • Where did C come from? • Which is more common – C, or Si? • Why is C so important – why not Si? • Why is N so important, yet we can’t breathe it? • How is N obtained by living things? • Why is the ocean salty, while rivers are fresh? • What does Fe tell us about the history of O?

  5. Genesis – How and where did life begin? Aquagenesis Terragenesis Life began on land in volcanoes • Life began in oceans What is the evidence for each? Which one makes more sense?

  6. Good sources to start from • Hydrothermal Vents http://video.nationalgeographic.com/video/environment/habitats-environment/habitats-oceans-env/hydrothermal-vents/ • Alternative biochemistry http://en.wikipedia.org/wiki/Hypothetical_types_of_biochemistry • http://nai.arc.nasa.gov/astrobio/feat_questions/silicon_life.cfm • http://www.dailygalaxy.com/my_weblog/2007/06/noncarbon_lifef.html • http://en.wikipedia.org/wiki/Sulfate-reducing_bacteria

  7. Paradoxical Planet – the Research • Pick one element. Then find out the following… • Where is it thought to come from? • What’s its geological history? • What makes it important to life? • How does it cycle through the environment? • Alternatives – Why this element, and not something else closely related and more common? • How does man’s activities affect this cycle?

  8. Paradoxical Planet – the Product • Develop a powerpoint that profiles the 5 questions from the previous slide. • Be sure to cite all sources in a Bibliography frame. • Counts as a journal lab (daily grade) • DUE – Friday, 6 September at end of class, along with Week 2 Study Questions

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