Essential Questions: Island arcs and oceans trenches.

1- How and where do ocean trenches form?

Theses trenches form at convergent plate boundaries when one plate is subducted beneath another.

2- Describe an island arc?
Curving chains of volcanic islands and sea mounts are almost always found parallel to the concave edges of trenches.

3- what's the deepest trench in the world?

Mariana trench of the western pacific, where the ocean bottom is 11, 022 meters.

4- what trench does Japan lay next to?

Kuril- Japan Trench.

5- Why do islands arcs, ARC?(why aren't they a straight line?

Because they are formed by tectonic and volcanic activity associated with subduction.