Chapter 6 The Earth. Our Earth is a very special place.
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Transcript of Chapter 6 The Earth. Our Earth is a very special place.
![Page 1: Chapter 6 The Earth. Our Earth is a very special place.](https://reader036.fdocuments.in/reader036/viewer/2022081518/55166474550346a2698b52cd/html5/thumbnails/1.jpg)
Chapter 6The Earth
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Our Earth is a very special place.
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Seeds Of Life
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Thank you liquid water!
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Not too hot, not too cold!
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Thank you magnetic field!
The Earth’s magnetic field shields us from the stream of charged particles from the Sun and cosmic ray particles from space
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Earth is the only terrestrial planet to have a significant magnetic field!
To have a significant magnetic field, the planet must:
1. Be a fast rotator- Earth takes 24 hours to rotate
2. Liquid metallic interior- Earth has outer molten iron core
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Aurora
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Earth’s interior consists of a rocky mantle and an iron rich core
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Differentiation
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Earth’s surface is composed of about twelve major plates which slowly move relative to one another
separation
Collision of two plates forms mountains
Plate Tectonics
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The San Andreas Fault
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Plate tectonics is driven by convective currents in Earth’s mantle
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Plate tectonics produced major changes to the Earth’s surface over the past 200 million years
Continental Drifting
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Earth in the Future
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What would it be like to live in Pangaea?
• Do you think we can learn to get along?• How would it affect:
politics/government
travel/vacationing
animal migration
population
country boundaries
import/export
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Composition of the Earth’s primitive atmosphere
• First atmosphere (4.4-4.6 billion years ago): hydrogen and helium
• Second atmosphere (4.4-4.0 billion years ago): water vapor, ammonia, and methane
• Third atmosphere (3.3-4.0 billion years ago): 98% carbon dioxide, 2% water vapor and nitrogen
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Volcanic eruptions and impacts from asteroids and comets may have created our primitive atmosphere
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Thank you bacteria!
Current atmosphere (present day-3.3 billion years ago):
78% nitrogen and 21% oxygen
Cyanobacteria helped to produce oxygen and remove carbon dioxide
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Thank you ozone layer!
• Oxygen was important for producing ozone since ozone is O3
• The ozone formed before early life could move from the oceans onto dry land
• The ozone protects the surface from hazardous UV radiation from the Sun
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Chlorofluorocarbons (CFC’)
• Our Ozone is destroyed by CFCs which are chemicals produced by refrigeration, air conditioners, foam and aerosols
• They are very efficient at removing ozone
• Ozone slowly replenishes itself as it is created from sunlight and lightning