Volcanic

 Canada is known for quakes. The West Coast is seismically active, with Vancouver Island being part of the so called Cascadia Subduction Zone, long overdue for a major earthquake. The St. Lawrence and Ottawa Valleys are part of an old, minor fault line; a few years ago there was a quake in the city. Not a big one, but one you could feel happen.

The photographs on this display show examples of earthquakes at their most destructive.

Across from it, more photographs, this showing the aftermath of the destructive power of volcanoes.

There are several types of volcanoes, and here the displays include rock types associated with specific volcanoes. There is the lava dome.

Composite cones are the next one.

Cinder cones are another.

Shield volcanoes are big.

Even bigger, the flood basalt, which are an extreme rarity. They are thought to be the cause of mass extinctions, and there hasn't been one of these in millions of years- the Columbia River Basalt group.

Here we have ophiolites, rocks that are associated with continental crust.