3.  Intrusive igneous rock features come from magma cooling underground.  Includes:  Dikes  Sills  Volcanic necks  Batholiths  http://www.youtube.com/watch?v=6loGYTCBVqo http://www.youtube.com/watch?v=6loGYTCBVqo

4. Shiprock, New Mexico

5. Dike Volcanic Neck http://www.wwnorton.com/college/geo/animations/volcanic_neck.htm

6. Devil’s Tower, Wyoming, a Volcanic Neck

10. Volcanic Dike near Devil’s Tower

11. Another View of the Volcanic Dikes

13. Volcanic Sill

14. Yosemite Park, California Batholith

15. Yosemite Park, California Batholith

16. Yosemite Park, California Batholith

17.  The Fish Canyon eruption in southwestern Colorado about 28 million years ago erupted more than 5,000 km 3 (3,107 miles 3 ) of magma from the La Garita caldera. That is enough magma to bury the entire state of California to a depth of nearly 39 feet.  Colorado has at least nineteen calderas including one of the world’s largest, the La Garita Caldera. It is so large (22 by 47 miles) that for a long time it was hard for geologists to realize that they were mapping in a giant caldera.

18.  The scale of La Garita volcanism was far beyond anything known in human history. The resulting deposit, known as the Fish Canyon Tuff, has a volume of approximately 5,000 cubic kilometers (1,200 cu mi), enough material to fill Lake Michigan (in comparison, the May 18, 1980 eruption of Mt. St. Helens was only 1.2 cubic kilometers (0.3 cu mi) in volume).

20.  Crater Lake formed around 5,677 (± 150) BC when Mount Mazama exploded.  Crater Lake is the deepest lake in the Western Hemisphere and the third deepest in the world.  Its deepest point has been measured at 1,949 feet.