Throughout the world, circulating magma energizes tectonic boundaries that mold land into mountains, volcanoes, valleys, and hills. While the tectonic boundary between Point Reyes and the rest of North America divides and shapes the landscape along the San Andreas Fault, tectonic activity also shapes our entire planet. It is also the site of geologic forces that give rise to earthquakes and shape the land as we know it. The San Andreas Fault is such a boundary, the division between two great tectonic plates: the Pacific Plate and the North American Plate. Along geologic boundaries, landscapes are shaped. Along the cell membrane, hormones initiate chemical reactions within the cell. Along the air/water boundary, light bends, or refracts, as it leaves one medium and enters another. Boundaries are also places of dynamic change. They mark where one thing ends and another begins. On the Boundary of Changeīoundaries limit and divide. The San Andreas Fault separates the Point Reyes peninsula from the California mainland.
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