Here's why:
* Divergent boundaries are where tectonic plates move apart. This separation causes the lithosphere (Earth's crust and upper mantle) to thin and break.
* Rift zones are areas where the Earth's crust is being pulled apart, leading to the formation of valleys, volcanoes, and earthquakes.
* Pull-apart rift zones are a specific type of rift zone where the plates are moving horizontally apart, creating a "pull-apart" effect. This can lead to the formation of grabens (down-dropped blocks of crust) and other geological features.
Examples:
* The East African Rift Valley is a classic example of a pull-apart rift zone where the African plate is splitting.
* The Mid-Atlantic Ridge is another example of a divergent boundary where new oceanic crust is being formed as the plates pull apart.
Therefore, pull-apart rift zones are a direct consequence of the divergent plate boundary process.
