1. 1/7 DO: Today we will continue learning about the history of Earth.
Bell work
Notes, Chicken or Egg Video, time sequencing
Work on Timeline
1/7
DO: Today we will continue learning about the history of Earth.
DQ :
Which came first, the chicken or the egg? Explain why you think this.

2. Sequencing Time Activity
Numerical Time: Time that relates to the use of actual numbers and time-frames.
Sequential time: time that relates to the order of events rather than the actual number.
You will place events in your life in a sequence first!
You will then add numerical time to your timeline.
You will finally divide your life into eras.

3. Geologic History

4. Pre-Cambrian
Hadeaon EON – Formation of the Earth and Solar System – 4.6 bya
Archeaon EON – First life appeared!
They were single celled organisms (blue-green algea)
Proterozoic EON – First milti-cellular animals by the end!

5. Paleozoic Era & Cambrian Period
Cambrian Era
Paleozoic Era & Cambrian Period
mya
Known as the Cambrian EXPLOSION!
Meaning there was a large explosion of lifeforms!
Skeletonized animals (exoskeletons)
trilobites
Warming climates

8. Evolution of life in Cambrian (10 min) https://www. youtube. com/watch
Gentle Giants of Cambrian (5 min)
Adaptation: a change or the process of change by which an organism or species becomes better suited to its environment.
Anomalocaris: Main predator of the Cambrian
Trilobite: main prey organism of the Cambrian. Was also the most successful organism.

10. Paleozoic Era - Ordovician Period
mya
diversification of marine organisms
evolution of plants onto land.
The Ordovician ended with a mass extinction.
Development of coral reefs

12. Paleozoic Era Silurian Period
mya
The start of significant life on dry land
First Vascular Plants
Sea Scorpions

14. Sea Scorpions

15. Paleozoic Era Devonian Period
mya
“Age of the Fishes”
Examples, placoderms, lobefin fish, cartilaginous fish, and bony fish
First true trees
Late Devonian extinction

17. Paleozoic Era Carboniferous Period
mya
“Coal Age,” very well known for plant fossils that make up the world’s major coal seams
“Age of the Amphibians,” including ancestors of modern terrestrial vertebrates
Evolution of amniotic egg in reptiles

21. Amphibian eggs
Newly discovered “legless” amphibian- produces eggs that have yolk

22. Paleozoic Era Permian Period 299-252 mya
Great diversity of amphibians and early reptiles
Therapsids were common (mammal-like reptiles)
Greatest diversity of insects of all time
Seed plants became more dominant
The period ends with the largest mass extinction in the past 600 million years

25. Mesozoic Era Triassic Period 252-200 mya
Late Triassic- the origin and rise of dinosaurs
and the first mammals
Emergence of giant marine reptiles (ichthyosaurs)
Extinction event at the end of the period

27. Mesozoic Era Jurassic Period 200-146 mya
“The Age of the Dinosaurs”, stegasaurs, theropods, and huge sauropods, Allosaurus
Origin of birds, pterosaurs- Archaeopteryx

28. Mesozoic Era Cretaceous period 146-65.5 mya
Cretaceous means “chalk”
Huge chalk deposits were created due to the accumulation of dead marine algae
Sauropods, Iguanodon, Triceratops, Tyrannosaurus rex, Spinosaurus, mosasaurs
Diversification of birds
Extinction of dinosaurs
Giant asteroid crater in Central America

30. Cenozoic Era Tertiary Period 65.5-2.6 mya
Birds flourished in the skies as the holdouts of the dinosaur age
Grasslands emerge and become the most successful plant on Earth
Herds of grazing mammals are seen
Kelp evolves, sea otters, & dugongs (related to the elephant)
Megalodon appears as the biggest shark of all (15meters long)
Two-footed Hominins split from chimpanzees

32. Dugongs- a marine mammal related to the elephant

33. Cenozoic Era Quaternary Period 2.6 to present mya
“Age of Humans”
Whales and sharks rule the seas
Massive mammals evolve such as mammoths, rhino and bison with shaggy coats adapted to the ice age
Ice ages are the result of the Earth’s wobbly orbit around the sun
Summary video