Week 9: Geologic Time

1. The big question addressed in lab, and a description of what you did.
1. In lab, we focused on significant events in the history of the Earth. We have 4.3 billion years on this Earth, but most things didn't happen until .5-1 bya. The Earth is completely different from when it originally appeared. We used biointeractive.org (earthviewer) to find the timing of the geologic events and added them to the timeline.
2. A description of what you learned in Thursday's lecture.
1. In lecture we took the space science exam.
3. Answer questions about the weekly textbook reading:
1. What did you learn?
1. If the entirety of Earth's history was represented on a clock, humans wouldn't appear until 11:59:40. There have been 3 times in Earth's history where the entire planet was entirely ice. That happened because of a positive feedback loop. The reason that the snowball earth ended is because volcanoes kept erupting which caused the carbon dioxide to build up and start melting the ice, which led to a new feedback loop of warming the planet. There used to be a supercontinent, but since has drifted apart. 
2. What was most helpful?
1. The images and diagrams in the chapter were the most helpful for me.
3. What do you need more information on?
1. I can't wrap my brain around the snowball earth at all.
4. What questions/concerns/comments do you have?
1. I am wondering how the continents began to break up?

Convection Cells Video