1. Geologic History Of Washington State
... Around 1.2 billion years ago, the lands on 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 ... changes that may have contributed to a mass extinction where near 90% of all species were eliminated, and is the largest extinction in the Earths history, even larger than the Dinosaur extinction. Pangea lasted throughout most of the Permian and Triassic Periods a span of some 100 million years. Sedi...
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- Approx Pages: 5
- Grade Level: High School