1. How and where do ocean treches form?
These form at covergant plate boundaries when one plate i subducted 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 Japn lay next to?
Japan Trench
5. Why do island arcs ARC?
Since its subducting on a shere the converside is steeper so its forms on arc.
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