the evolution of the atmosphere: 4.6 to 1 billion years ago by ms. holl
TRANSCRIPT
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The Evolution of the Atmosphere:
4.6 to 1 billion years ago
By
Ms. Holl
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Introduction
THREE PARTS:
• PART I: Volcanoes
• PART II: Single-Celled Plants
• Part III: Multi-Celled Plants
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Part I
Volcanoes
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Part II
Multi-Celled Plants
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Formed by colonies cyanobacteria.
At least 3.5 billion years old.
Carbon is stored in stromatolites.
Fact:
Chloroplasts are actually cyanobacteria living in plant cells!
Stromatolites
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0.5 to 3.5 billion years ago
Shark Bay, Australia
Stromatolites, colonies of cyanobacteria, are alive in Australia today.
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2-3 billion years ago: Little free oxygen
Commonly occur in sedimentary rocks 2-3 billion years old.
Alternating dark bands (containing FeO) and light bands of chert (silica and Fe2O3).
Occur from the deposition of alternately dissolved FeO & chert.
“Bands” occur from fluctuating densities of bacteria in an ocean. When bacteria blossoms, it creates oxygen and thus chert, which falls to the ocean floor. An oxygen depletion allows for FeO.
Banded iron formation
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History of Atmospheric Oxygen
From Lunine 1999 based on Kastings (1991)
The presence of FeS2 and UO2 set upper limits because oxygen would have produced other oxides from U and Fe
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Red beds
Occur earlier than 2 billion years ago.
Form when iron is weathered out of rock in the presence of oxygen.
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Part III
Multi-Celled Plants
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Summary• PART I: Volcanoes add carbon dioxide, ammonia,
methane, and water vapour to the atmosphere. • PART II: Single-celled plants begin to photosynthesize
which decreases the amount of carbon dioxide and increases the amount of oxygen in the atmosphere. The oxygen reacts with ammonia from volcanoes to add nitrogen to the atmosphere.
• PART III: Multi-celled plants evolved which adds even more oxygen to the atmosphere. More nitrogen is added as plants decay and are consumed by denitrifying bacteria.
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Review Questions
• Millions of years ago, the atmosphere contained the following gases: – Ammonia, carbon dioxide, methane, nitrogen,
oxygen and water vapor.
• Which of these gases has increased?
• Which of these gases has decreased?
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Review Questions
• Does photosynthesis increase or decrease the amount of oxygen in the atmosphere?– WHY?
• Does photosynthesis increase or decrease the amount of carbon dioxide in the atmosphere?– WHY?
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Review Questions
• How did volcanoes change the atmosphere?
• How did single-celled plants change the atmosphere?
• How do multi-celled plants change the atmosphere?
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To think about…
• How is the composition of the atmosphere changing today?
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http://rainbow.ldeo.columbia.edu/courses/v1001/7.htmlhttp://www.geol.umd.edu/~kaufman/ppt/chapter3/sld019.htmhttp://www.uta.edu/geology/geol1425earth_system/images/
gaia_chapter_11/ArcheanLandscape.jpghttp://www.uta.edu/geology/geol1425earth_system/1425chap11.html
http://www.geol.umd.edu/~kaufman/ppt/chapter3/sld019.htmhttp://www.exhibits.lsa.umich.edu/Exhibits/Anthropology/Diaramas/Nat.Am./Copper/Copper.html
http://www.novaspace.com/LTD/TUCC/PIX/Atmo.jpeghttp://www2.jpl.nasa.gov/files/images/browse/p46022bc.gif
http://www.gsfc.nasa.gov/gsfc/earth/pictures/pinatubo/atmosphere%20after.jpghttp://commons.wikimedia.org/wiki/Image:Air_composition_pie_chart.JPG
http://www.photolib.noaa.gov/sanctuary/images/big/sanc0001.jpg
Picture SourcesPicture Sources
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Information SourcesInformation Sources
• http://www.udayton.edu/~INSS/ThemeEvol/EvolTimeline.HSM.ppt
• http://www.lpl.arizona.edu/undergrad/classes/spring2006/Griffith_102-13/LectureNotes/L36-Evolution-Life.ppt
• http://thurmanscience.tripod.com
• http://www.olduniverse.com/1,2.htm