Islamic culture. if it is what you're looking for.
The answer to your question is,
Two. The twin towers both collapsed.
-Mabel <3
Similarities :Both alluvial fans and deltas deposit sediment.
Difference:
A delta forms when a river empties into a larger body of water. An alluvial fan forms on land where a river emerges from a mountainous area and flows out onto a more gently sloping plain. The decrease in slope causes the river to decelerate and deposit sediment, forming an alluvial fan.
I believe the answer is the last option
