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Chapter Slides - Fossils of bacteria-like organisms Among...

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Global reservoirs of water What is the source of ocean water? Why is the ocean salty? How much salt is in a liter of seawater?
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Why is ocean water so cold (avg. 39˚F)?
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The evolution of Earth’s atmosphere. The early atmosphere was reducing, with no oxygen. Nitrogen, carbon dioxide and water were the major components with traces of methane and ammonia. Through photosynthesis, oxygen entered the atmosphere about 2.5 billion years ago (the oxygen revolution). The production of oxygen is evidence of photosynthesis and early life on Earth. When did life on Earth begin?
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Banded Iron Formation (BIF) in Australia. BIFs likely formed in shallow seas on continental shelves, because they are too old to survive subduction. The BIF started to form about 2.7 billion years ago. Geological evidence of oxygen formation and life 3.7 billion years ago Today BIFs are a major source of iron ore for steel production.
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Unformatted text preview: Fossils of bacteria-like organisms. Among the oldest fossils ever discovered. Northwestern Australia - 3.5 billion years old. Cyanobacteria? Photosynthetic oxygen production? Recent discovery of molecular fossils of cyanobacteria in 2.1 billion year old rock. Evidence of Early Life Did life begin in deep-sea hydrothermal vents?- protection from UV radiation (no ozone layer prior to evolution of oxygen in atmosphere)- liquid water (requirement for all life as we know it)- source of reduced chemicals for energy- mineral surfaces suitable for assembly of the biochemicals of life Earth’s history and future - its beginning and end The Scientific Method A great strength of the Scientific Method is the ability of theories to evolve as new information is obtained. Primordial Earth by Mark Rothko Painting referred to in Chapter 1 of Mapping the Deep...
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