Most volcanoes occur along which plate boundarys?

1- Volcanos are most commonly found at subduction zone boundaries. This is where the thinner oceanic plates get pulled under the thicker continental plates. As the plates go deeper, they melt and form pockets of magma which can cause mountains to be built and as the hot magma rises, it erupts out of volcanos.

2- Volcanism occurs regularly at two of the three types of plate Boundaries. The most volcanism occurs at diverging plate boundary where plates separate. Volcanoes also form at converging plate boundaries where one plate dives beneath the other at subduction zones.

Explanation:

France is bordered by the English Channel and Bay of Biscay; Belgium, Luxembourg, and Germany to the north, Switzerland and Italy to the east and Spain to the south.

The Garonne River runs for 357 miles through southwestern France and northern Spain. From its headwaters in the Pyrenees, it follows the Aran Valley northward into France, flowing through Toulouse on its way to Bordeaux, where it meets the Gironde estuary—which flows into the Atlantic Ocean at the Bay of Biscay.