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Low-grade metamorphic rocks are typically formed deep at the base of mountains. This is because the process of mountain-building, known as orogenesis, involves intense pressure and temperature conditions that lead to the metamorphism of existing rocks into low-grade metamorphic rocks. As tectonic plates collide and push against each other, the rocks at the base of the mountains experience these changes, resulting in the formation of low-grade metamorphic rocks.
Another place where low-grade metamorphic rocks can be found is in rock layers beneath the ocean floor. The heat and pressure exerted on these rocks due to the movement of tectonic plates beneath the oceans can also lead to the formation of low-grade metamorphic rocks over time.
In summary, low-grade metamorphic rocks are commonly formed deep at the base of mountains and in rock layers beneath the ocean floor due to the intense pressure and temperature conditions associated with tectonic activity in these areas.
