Precambrian

Era…

By: Lara Susana L., Maria Paula V.,

Andres Felipe G. -- Pablo Jose O.

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.

How

did

it

look…

oThe sky was a piknish-orange color

oThe oceans were brown

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.

Oxy

gen? Oxygen created the

ozone layer. Tons of organisms became extinct.

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