Pacific Plate

borders

mention

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Meadowbrook, with Thornton Creek near Lake Washington, has been inhabited since the end of the last glacial period (c. 8,000 BCE—10,000 years ago).

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In the Early Jurassic the Pacific Plate opened originating from a triple junction between the Panthalassic Farallon, Phoenix, and Izanagi plates.
For the most part, the North American Plate moves in roughly a southwest direction away from the Mid-Atlantic Ridge at a rate of about 2.3 centimeters (~1 inch) per year. At the same time, the Pacific Plate is moving to the northwest at a speed of between 7 and 11 centimeters (~3-4 inches) a year.
The [Pacific] plate first came into existence as a microplate 190 million years ago, at the triple junction between the Farallon, Phoenix, and Izanagi Plates.
Birth of the Pacific Plate 180 million years ago (Wikimedia Commons)

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tectonic plate
Pacific Ocean

wikipedia

Pacific Plate (Wikipedia) The Pacific Plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At 103 million km2 (40 million sq mi), it is the largest tectonic plate.