1. How and where do ocean trenches form?
These form at convergent plate boundaries when one plate i suspected beneath another
2. Describe an island arc?
The arc shape results from the geometry of plate movement across the spherical earth, and the convex side of the arc points toward the ocean
3. What's the deepest trench in the world?
Mariana Trench
4. What's trench does Japan lay next to?
Japan Trench
5. Why do island arcs ARC?
Since its sub ducting on a sphere the converse is steeper so its forms on arc.
