1.   Beginning in the forearc zone and moving towards the volcanic arc the first feature encountered is the trench which rises to the outer-arc ridge.

2.   Between the outer-arc ridge and the volcanic arc a forearc basin may be formed.

3.   A complicated pattern of basins and ridges hind the volcanic arc.

4.   Back-arc spreading may be initiated within the volcanic arc because the high heat flux from below weakens the lithosphere.

5.   This eventually leads to the creation of a remnant arc from an active volcanic arc.

6.   This influences not only the nature of volcanic activity and landforms produced but also the processes tending to initiate back-arc spreading behind the volcanic arc.

7.   Volcanicity and magma emplacement, largely in the form of large granite intrusions, characterize the volcanic arc.

8.   In the volcanic arc, both in the Sunda Arc and to the north in Burma, movement is predominantly along transform faults.