In other words, almost no volcanism occurs between this 100-kilometre line (called the volcanic front) and the trench. Oceanic trenches outline the junction of the colliding plates, but the igneous activity takes place on the overriding plate along a line at least about 100 kilometres above the subducting plate (see Figure 3).
The rocks generated, however, are added on (accreted) to the continent. These boundaries are destructive and consume the subducting oceanic lithosphere formed at the divergent centres. In this case, granite batholiths underlie the great composite volcanoes and consist of rocks ranging from basalt through andesite to dacite and rhyolite. Igneous rocks associated with convergent plate boundaries have the greatest diversity. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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