Week 6: Geologic Time

  1. What did you do in lab today? 

Quiz Review Topics 

  • Shadows
    • If the sun is ______ and I'm at ______ where is my shadow pointing?
  • Moon Phases
    • new moon = no moon 
    • full moon = all moon
    • waxing quarter
    • waning quarter
  • Solstice, equinox 
    • Equinox = equator 
    • Solstice = winter vs summer 
    • summer solstice = sun at cancer
    • winter solstice = sun at capricorn
  • Tropic Lines: Cancer (N), Equator, Capricorn (S)
  • Lifecycle of Stars, Galaxies, Meteor "lifecycle"
    • 3 types of galaxies: Spiral, irregular, elliptical (milky way is spiral) 
    • Andromeda is the galaxy we might collide with
    • stars start as a nebula, then explodes to star, can turn into a nebula or a black hole
    • when a meteor enters earth's atmosphere it becomes a meteorite 
Earth Science 
  • Big Bang: 13.7 b.y.a
  • Earth: 4.65 b.y.a
  • EarthView BioInteractive

2. What was the big question? What is the history of the Earth and how does that affect us today?

3. What did you learn in Thursday's discussion? 
Notes:

No lecture, took Quiz 1 on 10/2

4. Read online textbook, chapter 6:
- What did you learn? 
  • Earth formed approximately 4.65 billion years ago, its history is mapped using the geologic time scale
  • Life began with simple prokaryotic bacteria around 4 billion years ago, followed by aquatic organisms, terrestrial life, and eventually humans.
  • The concept of "snowball Earth" explains periods when the planet was nearly entirely frozen due to a positive feedback loop involving ice and sunlight reflection.
  • Volcanic activity played a crucial role in ending snowball Earth by releasing carbon dioxide, which eventually warmed the planet.
- What was most helpful? 
  • The timeline of major evolutionary milestones, from bacteria to humans, was especially helpful for understanding the progression of life on Earth.
  • The explanation of the positive feedback loop and albedo effect clarified how global freezing events could escalate and how they were eventually reversed.
  • Visual aids like the geologic clock and Earth in a day (the clock).
- What do you need more information on?
  • More detail on how scientists gather evidence for Snowball Earth, do rocks play a role in it?
  • How did bacterial life survive extreme conditions during global ice ages?
  • Did the atmosphere change over time? How?
5. What questions, concerns, and/or comments do you have? N/A

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