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Scientists believe the earth was formed
4.5 – 4.6 billion years ago
Oxygen levels rose 2.5 billion years ago
Animals begin to move from sea to land
› Spiders & Scorpions
› Amphibians
Reptiles begin to appear and take over› Temperature extremes in interior of Pangaea
› Reptiles adapted to dry conditions and grow large
Largest Extinction› 95% of marine species and 70% of land
animals were wiped out
› Climate change caused by global warming and cooling
volcanic activity altered ocean currents
Dinosaurs
› 240 million years ago
Triassic Period
Pangaea Breaks up
Small Furry animals come from therapsid
mammal-like reptiles
› Stayed small until dinosaurs died out
Dinosaurs dominate
› Jurassic Period
Birds
› 150 million years ago
› Reptile-like with feathers
Dinosaurs go extinct
› 65 million years ago
› Global cooling
› Massive meteorite
Mammals grow and rapidly change
› Now that dinosaurs are gone
› Cats, dogs, skunks, horses, elephants,
primates, rodents
Ice Age
› Distinctive animals
Wooly mammoth, wooly rhinos, extinct arctic
fox, polar bears
Homo Sapiens
› “wise man”
› 500,000 years ago
› Stone-tipped spears, bone needles, bone fish hooks
› Sewed clothes from skins, boots
› Buried dead in ceremony
“Moderns” and Cro-Magnon
› “homo sapien sapiens”
› Bows and arrows
› Huts with hearth for fire
› Jewelry
› Cave art
› Statues
› Tools
Turn to Page 2 in your
Ancient World book and
read the “We Love Lucy”
article. Write out 3
questions you might ask
about this article.
Footprints
› Discovered in 1976
by scientists in
Tanzania
Preserved in Stone
› Showed evidence
of upright walking
humans as early as
3.5 million years ago
Fire
› Discovered 500,000
years ago
› Rubbed 2 sticks
together/striking
stones together for
sparks
› Enabled people to
live in cold climates
Writing
› 3000 BCE
› Sumerian Cuneiform
and Egyptian
Hieroglyphics
generally
considered world’s
first writing systems
› History begins to be
written down
Would you rather read a
book with pictures or a
book without pictures?
Explain your answer. (3
sentence minimum)
What meanings can we
draw from cave
paintings? Why did Pre-
Historic people use
drawings to present these
meanings?