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No matter how cold the weather is outside, Grover Hot Springs always maintains a toasty temperature of over 100 degrees Fahrenheit. It isn’t humans keeping the springs warm--it’s magma. That’s because this area rests on a fault line. Fault lines are cracks in the earth’s surface, and this one is caused because the plate that makes up the North American continent is constantly colliding with the Pacific plate. These collisions cause pressure, which forces the heavier Pacific plate underneath the American plate (a process called subduction), turning it into magma. The cracks in the Earth formed by this process are called faults. Grover Hot Springs is heated by one of these faults, using a process called convection. This section’s Learning Topic will teach you all about convection, so you can learn how it’s possible to take advantage of the power of magma as you enjoy a relaxing soak at the Grover Hot Springs.
Before human intervention, Grover Hot Springs did not look like a swimming pool. Instead, it was a series of springs and seeps of warm water that rose into the marshes in the area. White, crumbly deposits of limestone caked the rims of the springs. In the late 1800s, settlers shaped the pools, combining hot and cold springs to reach an enjoyable temperature.