* Convergent Boundaries: These are where tectonic plates collide. One plate usually subducts (slides) beneath the other. This process leads to:

* Volcanism: The subducting plate melts, creating magma that rises to the surface, forming volcanoes like Mount Hood.

* Mountain Building: The collision of plates also pushes up mountains.

* How Mount Hood Formed: Mount Hood is part of the Cascade Range, which is a chain of volcanoes formed by the subduction of the Juan de Fuca Plate beneath the North American Plate.

* Other Boundary Types:

* Divergent Boundaries: Plates move apart, allowing magma to rise and create new crust.

* Transform Boundaries: Plates slide past each other horizontally, causing earthquakes.