Week 9 Blog

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 Lab:

In lab this week we learned about the Earth and its timeline. Our first life forms on Earth started in the water. Fish were on Earth before plants appeared 440 million years ago. Once land plants were on Earth, amphibians were able to have food to survive. Pangea occurred 335 million years ago. The first dinosaur appeared 225 million years ago. I was interested to learn that oxygen wasn't always on Earth. 



Pressbook: 

The pressbook described the timeline of the Earth and how it was created 4.67 billion years ago.  The Earth was covered in ice about three times in Earth's history.  To melt the ice, people believe volcanos continued to erupt under the ice layers. Later on, the continents were created when Pangea broke apart into pieces. Scientists, including Wegener, believe Pangea existed because fossils spread throughout the continents. It shows that animals could walk to different continents since they were all connected in Pangea. 






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