What formed the Great Rift Valley?

1:volcanic activity and tectonic movement
2:a massive earthquake 200 years ago
3:a mountain range west of the valley
4:a massive basin in the valley's center

Respuesta :

 The Great Rift Valley was formed by huge subterranean forces that tore the earth's crust apart, causing chunks of the crust to sink into the earth.

Therefore, #1. Volcanic activity and tectonic movement
1. Volcanic activity and tectonic movement