Volcanoes

In The Restless Northwest, former Seattle Times science writer Hill Williams provides a fascinating overview of the geological processes that shaped the Northwest.

An attraction of the region is its varied terrain, from the volcanic Cascade mountain range to the flood-scoured scablands of eastern Washington and the eroded peaks of the northern Rockies. The vast differences, Williams notes, are the results of the collision of the old and the new. The western edge of Idaho was once the edge of ancient North America. As eons passed, a jumble of islands, minicontinents, and sediment piled up against the old continental edge, gradually extending it west to … » More …