4.65 billion years ago a Solar Nebula, a cloud of gas and dust, collapsed! It’s particles condensed
forming planets, asteroids, and other smaller bodies. Most of the matter compacted to form….
The Outer Planets
Farther from the sun, made of Hydrogen and Helium.
The Terrestrial Planets
Largely made up of Iron, Silicates, and
Mars-- Cold, all water is frozen. Atmosphere 100
times thinner than Earth’s. Clouds of ice and
frozen CO2 drift over the surface.
Venus-- A stifling inferno! Surface temperatures
greater than 8600 F. Atmosphere 100 times thicker
than Earth’s, made up almost completely of CO2.
Earth-- A developed Carbon Cycle keeps Earth
habitable. Temperatures vary over the planet but
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"Over 100,000 People Enlist to Colonize Mars." N.p., n.d. Web. <Over 100,000 People Enlist to Colonize Mars>.
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Web. 05 Sept. 2013. <http://solarsystem.nasa.gov/planets/profile.cfm?Object=Neptune>.
"Solar System Exploration: Planets: Uranus: Overview." Solar System Exploration: Planets: Uranus: Overview. N.p., n.d. Web.
05 Sept. 2013. <http://solarsystem.nasa.gov/planets/profile.cfm?Object=Uranus>.
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Testing the Thermostat: Snowball Earth Dani Beck
Early Life: Single-Celled Organisms (Jennifer Ellis)
First Billion Years: Bacteria and Archaea
The Cambrian Explosion and
the Diversification of Animals
Maribeth Villanueva, Period 4
What is The Cambrian Explosion?
“The rapid diversification of multicellular animal life that took place around the beginning of the
Cambrian Period. It resulted in the appearance of almost all modern animal phyla.”
What about phyla?
“The primary subdivision of a taxonomic kingdom, grouping together all classes of organisms that
have the same body plan.”
How did this happen?
Growing organisms that later evolved into more complex life forms created an “ecological relationship”
that had a distinct role in much larger organisms and a rising oxygen level in the atmosphere. Also,
there was a mass extinction at the end of the Proterozoic era, right before the Cambrian, so the
What happened during this?
Life took 3 giant steps.
The Evolution of Early
By: Geoff Ashton
With Old Endings
Come New Beginnings
● Mammals were the size of rodents
● KT-Boundary Extinction
● Very few predators
● Held an internal temperature
● Mammal’s went all over Laurasia and
● Dominant form of land plants
● Seeds were enclosed inside the
● Fertilized ovaries grew
● Became the main type of plant life
● Extreme warming in the cenozoic era
due to the breakup of Gondwanaland
● Ocean currents trapped by Antarctica
● Led to our most
recent ice age
Apes in Africa
● The Genus Homo
● Homo erectus went from Africa to
China and Eurasia
● Homo Sapiens settled in europe,
30,000 years later, North America