The rock may be sedimentay
It created tension in the Earth's plates and they moved to form a tsunamai.
B. Crystal size is a function of cooling time. The longer a melt cools the larger the crystals.
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.
