Date post: | 01-Jan-2016 |
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How
did
the
Eart
h f
orm
?• Earth formed as
cosmic debris collided.o Asteriods struck Earth.oThe entire globe melted.
How
was e
arth
back
then…
oViolent volcanic activity.
o Earth cooled 4.2 billion years ago.o Water condensed and
rain fello Oceans formed
o There was little oxygen, just other gases.
First
Mole
cule
s…• Microspheres:
• Cells similar to
bacteria
• Developed
characteristics of
living cells
• Selectively
permeable
membranes
• Simple
means of
storing and
releasing
engergy
o Mixtures we have
now (amino
acids)
o Developed
from simpler
compounds
About 3.8 BILLION years ago!
200-300 million years ago…
Oxy
gen?
Lots of photosynthetic Bacteria. Made lots of oxygen. Oxygen mixed with iron in the oceans and created rust.Rust sunk to the bottom of the ocean.Ocean color changed.
Our
Ance
stors
…
o Endosymbiotic theoryo Prokaryotic cells entered
ancient eukaryotic cells
o Developed a symbiotic
relationship. o Mitochondria o Evolved from prokaryotes that used
oxygen to create ATP
o Chloroplastso Evolved from prokaryotes that could
photosynthesize.
*http://bldgblog.blogspot.com/2007/04/precambrian-motorways.html
*http://fromthepaganvastlands.blogspot.com/2011/03/ocean-precambrian-2007.html
*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://timerime.com/es/periodos/533778/preCambrian+Era/
*http://www.humboldt.edu/natmus/lifeThroughTime/PreCam.web/index.htm
*http://www.geocaching.com/seek/cache_details.aspx?guid=0f39889e-c46d-4010-a976-f7caaadd8d56
*http://www.geocaching.com/seek/cache_details.aspx?guid=0f39889e-c46d-4010-a976-f7caaadd8d56