1. Geologic History Of Washington State
... Earth began to push together and plate tectonics created a giant continent known as Rodinia, which is Russian for "homeland." This was the dominant landmass of Earth for nearly 350 million years. Western North America used to lie next to what is now Australia and Antarctica. This world was a dark ... hostile one, where the only life to exist was probably single-celled organisms. Oxygen in the atmosphere was only 5% of what it is today, and was lacking the protective ozone layer to shield it from harmful radiation. These are the conditions in which Washington formed under more than a bill...
- Word Count: 1275
- Approx Pages: 5
- Grade Level: High School