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Precambrian Era…

Precambrian Era…. By: Lara Susana L., Maria Paula V., Andres Felipe G. -- Pablo Jose O. Earth formed as cosmic debris collided . Asteriods struck Earth . The entire globe melted. How did the Earth form?. Violent volcanic activity . Earth cooled 4.2 billion years ago.

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Precambrian Era…

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  1. Precambrian Era… By: Lara Susana L., Maria Paula V., Andres Felipe G. -- Pablo Jose O.

  2. Earthformed as cosmicdebriscollided. • AsteriodsstruckEarth. • Theentireglobemelted. How did the Earth form?

  3. Violentvolcanicactivity. • Earthcooled 4.2 billionyears ago. • Watercondensed and rain fell • Oceansformed • Therewaslittleoxygen, justother gases. How was earth back then…

  4. Theskywas a piknish-orange color • Theoceanswerebrown How did it look…

  5. 200-300 millionyearsago… Mixtures wehavenow (amino acids) Developedfromsimplercompounds Microspheres: Cells similar to bacteria Developedcharacteristics of living cells Selectively permeable membranes Simple means of storing and releasingengergy First Molecules… About 3.8 BILLION yearsago!

  6. Lots of photosynthetic Bacteria. • Madelots of oxygen. • Oxygenmixedwithiron in theoceans and createdrust. • Rustsunktothebottom of theocean. • Ocean color changed. Oxygen?

  7. Oxygencreatedthe ozone layer. • Tons of organismsbecameextinct. Oxygen?

  8. OurAncestors… Endosymbiotictheory Prokaryoticcellsenteredancienteukaryoticcells Developed a symbioticrelationship. Mitochondria Evolvedfromprokaryotesthatusedoxygentocreate ATP Chloroplasts Evolvedfromprokaryotesthatcouldphotosynthesize.

  9. *http://www.humboldt.edu/natmus/lifeThroughTime/PreCam.web/index.htm*http://www.humboldt.edu/natmus/lifeThroughTime/PreCam.web/index.htm *http://www.google.com.co/imgres?q=precambrian+era&hl=es&gbv=2&biw=1366&bih=643&tbm=isch&tbnid=DXgvks3kqtlE1M:&imgrefurl=http://timerime.com/es/periodos/709896/Precambrian%2BTime/&docid=2Im_4SyhnHfWvM&w=350&h=243&ei=2VppTuWWH4y-tge80LHLBQ&zoom=1 *http://www.geocaching.com/seek/cache_details.aspx?guid=0f39889e-c46d-4010-a976-f7caaadd8d56 *http://fromthepaganvastlands.blogspot.com/2011/03/ocean-precambrian-2007.html *http://www.geocaching.com/seek/cache_details.aspx?guid=0f39889e-c46d-4010-a976-f7caaadd8d56 *http://timerime.com/es/periodos/533778/preCambrian+Era/ *http://bldgblog.blogspot.com/2007/04/precambrian-motorways.html

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