When plumes of magma well up through Earth's lithosphere, they create volcanoes, islands, seamounts, and other features on ...

Most geologic activity stems from the interplay where the plates meet or divide. The movement of the plates creates three types of tectonic boundaries ... trenches like the Mariana Trench in ...

The plates are constantly sliding past ... Located east of Guam, the 7-mile-deep Mariana Trench formed when one tectonic place was pushed under another. The tectonic activity along the Ring ...