Final answer:
The difference in the angles of subduction between young and old crust is due to the differences in their density and age. Younger crust tends to have steeper subduction angles, while older crust has shallower subduction angles.
Step-by-step explanation:
In a subduction zone, the angles of subduction can vary. The angle of subduction refers to the steepness of the subduction zone where one tectonic plate is forced beneath another.
The difference in subduction angles between young and old crust can be attributed to the differences in their density and age. Younger crust is typically thinner and less dense, leading to steeper subduction angles, while older crust is thicker and more dense, resulting in shallower subduction angles.