1. The Rock Cycle The processes through which rocks are formed

2. Igneous Rocks  Form by the cooling of molten rock (either lava or magma)  Typically have a texture of random crystals  Form by the cooling of molten rock (either lava or magma)  Typically have a texture of random crystals

3. Iceland - 1980s, Alan Rubin

4. Eruption of Mount St. Helens - May, 1980 (commercial slide)

5. Mount St. Helens - 2004

6. Middle and North Sister - Oregon Cascades

7. Sedimentary Rocks  Often form when particles weathered from earlier rocks are transported (by streams, wind or glaciers) and deposited as sediment  The sediment is then buried and converted to rock by compression and cementation  Typically have a texture of small rounded particles cemented together  Often form when particles weathered from earlier rocks are transported (by streams, wind or glaciers) and deposited as sediment  The sediment is then buried and converted to rock by compression and cementation  Typically have a texture of small rounded particles cemented together

8. French Pete Creek - Oregon Cascades

9. Basin and Range - eastern Nevada

10. Cochetopa Creek near Gunnison, Colorado

11. Creek building delta into Lyman Lake - Washington Cascades

12. Cape Cod, Massachusetts

13. Canyonlands National Park, UT - Needles section

14. Metamorphic Rocks  Generally form when earlier rocks are subjected to high temperatures and/or pressures (BUT without melting!)  Typically have a crystalline texture, with a pattern to the arrangement of crystals  Generally form when earlier rocks are subjected to high temperatures and/or pressures (BUT without melting!)  Typically have a crystalline texture, with a pattern to the arrangement of crystals

15. Mt. Jefferson, Oregon Cascades

16. http://www.personal.psu.edu/users/c/l/cll161/insys%20441/main.html