history of the earth 1. order these vocabulary words from smallest to largest : universe, solar...
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History of the Earth
1. Order these vocabulary words from smallest to largest : universe, solar system, planet, galaxy
2. How are the geocentric and heliocentric models similar? How are they different?
3. Explain why this is incorrect: “If the Earth’s orbit got smaller, the length of the Earth’s year would increase.”Write in complete sentences!
Don’t talk during the Catalyst!
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Objectives
By the end of today, all SWBAT…
Describe the Big Bang Theory
Describe 7 important events in the history of the earth
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12 billion years: Big Bang Theory
The Big Bang was an explosion of matter that created the universe
http://www.aisee.com/anim/bigbang.htm
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Evidence of Big Bang Theory The redshift
When something that emits light moves farther away, the light looks more red
Light from faraway galaxies looks red…
Which means the universe is still expanding today!
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Redshift!
http://www.lon-capa.org/~mmp/applist/doppler/d.htm
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Formation of earth
1. Cloud of dust formed called nebula
2. Nebula forms disc with a ball surrounded by rings
3. Central ball forms sun and the rings form the planets of the solar system
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4 billion years: Earth’s atmosphere
The Earth’s atmosphere was formed by volcanoes that released gas as they erupted
Gases: Nitrogen (N2) Water (H2O) CO2
SO2
NO oxygen here
NO oxygen here
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3 billion years ago: Continents formed
The lithosphere cracked into pieces (plates) as the Earth cooled. The plates collided to create continents
Lithosphere = outer solid part of the Earth (crust and upper mantle)
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2.5 billion years: Oceans formedWater collected as oceans when Earth cooled
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2 billion years ago: First plants
Plants added oxygen to the atmosphere (through photosynthesis)
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340 million years ago: First ReptilesReptiles were the first animals to live on land
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250 million years: Pangaea formed
All continents formed one SUPERcontinent
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Evolution of the modern-day earthhttp://www.wwnorton.com/college/geo/egeo/flash/2_1.swf
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500,000 years: First Homo sapiens
Homo sapiens: modern-day humans
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If Earth’s history were a pie graph…
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Activity: Cat in the Hat
With a partner, quiz each other by pulling questions out of the “hat”
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Earth’s History Timeline
As a class we will put together a timeline of the history of earth.
Each group will be responsible for creating a poster of ONE EVENT in this history
Each poster must have: Title 3 facts about the event Picture Include WHEN the event occurred
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Exit questions
1. What happened in the Big Bang?2. Place these events in the correct
order (from oldest to most recent) First animals Atmosphere formed Continents formed First plants
Write in complete sentences!
Don’t talk during the Exit Question!