The tectonic plates that formed The Great Rift Valley were caused by __________.

The Great Rift Valley formed where tectonic plates pulled apart, stretching and breaking Earth’s crust. This movement causes earthquakes and can allow magma to rise and produce volcanic eruptions, making “earthquakes and volcanic eruptions” the best choice. Weathering, erosion, glaciation, and stream runoff do not create a tectonic rift valley.

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