Igneous...
Volcanic Rocks and Features

The photos below presently don't have links --but they are at sufficiently high resolutions for power point.

Stratovolcano, Mt. Rainier, WA.	Mt. St. Helens, Mt. Rainier, WA.	Cascade Volcanoes, Oregon.
Crater Lake Caldera, Oregon.	Echinus Geyser, Yellowstone NP.	Columnar jointing in basalt.
L to R: rhyolite, andesite, basalt.	Shield Volcano, Mauna Loa, Hawaii.	Cinder Cone, Mojave Desert, CA.
Pahoehoe lava flow, Hawaii.	Photomicrograph of basalt.	Pillow basalt, Lopez Island, WA.

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