With its cloak of tall firs, the volcanic cinder cone of Mount Tabor rises like a green oasis, climbing 400 feet above the neighborhoods of East Portland. The vistas, trails, birds, trees, staircases, ...

Volcanic cones are among the simplest volcano formations. They are built by fragments (called ejecta) thrown up (ejected) from a volcanic vent, piling up around the vent in the shape of a cone with a ...