* Formation: The Atlas Mountains were formed by the collision of the African and Eurasian tectonic plates. This collision caused the Earth's crust to buckle and fold, creating the mountain ranges we see today.

* Lack of Volcanic Activity: While there are some volcanic features in the region, they are not the primary characteristic of the Atlas Mountains. These volcanic features are usually associated with specific hotspots or rifts, not the main folding process that created the mountains.

* Fault Blocks: Fault blocks are mountains formed by the movement of large blocks of rock along faults. While faulting is involved in the Atlas Mountains' formation, the dominant feature is the folding.

In conclusion, the Atlas Mountains are primarily fold mountains, formed by the compression and folding of the Earth's crust due to tectonic plate movement.