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Page 1: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

History of Earth

Page 2: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 38 - Geologic Time ScaleSequence of events from Earth’s birth to present-day

(now).Each Era begins after a mass extinction of species. Four main eras:

1. Precambrian: Earth’s Birth and the life form known as Cyanobacteria evolved.

2. Paleozoic: Plants evolved.

3. Mesozoic: Dinosaurs evolved. Dinosaurs along with 90% of the other organisms living on planet Earth became extinct when a meteor hit Earth. The impact caused particles to fly in the air and block the sun, resulting in the ice age.

4. Cenozoic: (Present – day) – Humans evolved.

Page 3: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 39 - When Earth was born No life existed.

Surface So hot all of Earth was melted rock!

Atmosphere No O2 because no plants existed yet! Only gasses from outgassing (Volcanoes erupting).

Oceans No liquid water. Too hot! Everything was Water vapor.

Page 4: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 40 -Where did O2 come from?Photosynthesis from plants!

Page 5: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 41 - RocksWhere fossils are found!

Page 6: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 42 - FossilAnything left from a living organism.

Page 7: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 43 - Types of fossils

Petrified Fossil

Casts

Imprint

Page 8: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 44

Amber-Preserved

Ice - Preserved

Page 9: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 45 - Fast Fact!About 99% of species that

have lived on Earth are extinct.

Page 10: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 46 - How old are fossils? Relative Dating

Fossils found in layers closer to the surface are younger than the deeper layers.

Radiometric Dating

Measuring how much of an element is still present in a fossil, using the half life.

Page 11: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 47 - Half LifeAmount of time it takes for a radioactive

element to decrease by half.

Page 12: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 48 - PaleontologistPerson who studies fossils.

Size of Animal

How they moved

What they ate.

What climate they lived in.

When organisms lived.

Page 13: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 49 - Plate TectonicsPlate = Earth’s Crust

Tectonics = MovementPlate Tectonics = When Earth’s crust

moves

Crust floats on the mantle which is

composed of molten (melted) rock.

Crust is divided into plates! Constantly

moving (10 cm/year)

Page 14: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 50 - Pangaea “All Land”

All continents were once joined together.

Page 15: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 51 - Pangaea Separatedinto Laurasia and Gondwana.

Page 16: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 52 - Earth TodayNow 7 continents

As continents moved and surrounded by ocean, land species became isolated and evolve differently.

Australia has some of the most unique species in the world because it is so isolated.

Page 17: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 53 - AustraliaSince it is so isolated from any other land,

it has very unique species.

Page 18: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 54 - Stop and ThinkEquator = Warmest place on Earth.

Poles = Coldest Place on Earth

Page 19: History of Earth. Slide 38 - Geologic Time Scale Sequence of events from Earth’s birth to present-day (now). Each Era begins after a mass extinction of

Slide 55 - Fossil RecordOrdered levels of fossils in rock.

Indicates that organism have evolved in sequence.


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