How do back-arc basins form? View Available Hint(s) How do back-arc basins form? Tensional stresses resulting from slab suction stretch this part of the crust, causing it to thin vertically. Compressional forces bend the sedimentary layers in the back-arc region downward, creating a bowl-like depression. Compressional forces make the back-arc region thicker and denser than the volcanic arc. This higher density causes the back-arc region to sink into a basin shape. The back-arc region subsides into a downwarped basin shape from the added weight of addition of sediment from mass wasting events. A mountain range also forms on the side of the back-arc basin opposite of the volcanic arc, creating a lowland in between the two ranges.

Compressional forces bend the sedimentary layers in the back-arc region downward, creating a bowl-like depression.

Explanation:

The back-arc basin is formed with the weight of one tectonic plate on top of another. This happens when a tectonic plate with a higher density protrudes over a tectonic plate of lower density causing a "sinking" of the less dense plate. This causes a spread of the posterior arch that folds to form a trench-shaped depression. This "sinking" is called subduction and allows the upper tectonic plate to defeat the mantle on the overlapping plate, causing a greater chance of magma leaking onto the surface.

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