1. Today  Hand in LAB EQ Location & OLD WORK  Check the list in the back, if you owe something.  Get out a small piece of paper, PUT YOUR NAME ON IT.

2. Review –EQ LOCATION   P-wave & S-wave arrival times   Subtract (S-P time)   Look up Distance in Km (ESRT) – –HOW?   P-wave travel time (ESRT) – –HOW?   Origin Time (P-wave arrival – P-wave travel)

3. Quiz  Get out your ESRT  You have 15 minutes to hand in this quiz. NO more. Good luck

4. Plates and Volcanoes

5. Where do we find volcanoes?  Divergent plates ??? –YES!  Transform Plates ??? –NO! Not usually  CONVERTGENT Plates?? –YES!

6. Convergent Plates  Where two plates come together

7. Types of Magma  The type of magma that is made from the volcano is based on the mineral content.  More Aluminum and quartz = Felsic  More Iron, Magnesium = Mafic

8. Felsic Magma  Lots of Quartz  Sticky (high viscosity)  Can hold lots of pressure  Rocks from a felsic magma usually form Granite (density of 2.7g/cm 3 )

9. Mafic Magma  Very little Quartz  Not very sticky  Doesn’t hold pressure  Mafic magma makes Basalt (density of 3.0 g/cm 3 )

10. Types of lava  A’ A’ –Chunky  Pahoe’ pahoe’ –Ropy

11. How does magma effect Volcanoes?  If the magma holds the pressure it will blow up more violently  If there is less pressure more of a fluid eruption.  This allows different volcanoes to form.

12. Cinder Cone Volcano  When the eruption occurs rocks thrown from the volcano and land next to opening.  Small, but steep sides  Felsic magma

13. Composite Volcano  Layers of magma/lava flow on top of one another to form volcanoes sides.  Large and steep sides  Felsic magma – VERY EXPOSIVE! –Mt. Vesuvius in Italy

14. Shield Volcano  Large flattened volcanoes formed lava layering on top of others  Mafic Magma  Not Explosive!

15. Parts of a volcano

16. Intrusions  When magma makes its way into other layers on the earth.  Usually Sedimentary layers have igneous intrusions.

17. Hot Spots

18.  These are spots where the magma below is rising to the surface and the plates move over them.

19. NEXT   LAB 15 Page 60-64   1.) READ!!!!   2.) Fill in chart, use data on page 63.   3.) Plot data on page 63 in graph on page 64.   4.) Follow steps on page 61.   5.) Answer questions.

20. Today  Hand in any work needed.  Check the list in the back, if you owe something.  Get out a small piece of paper, PUT YOUR NAME ON IT.  When bell rings the quiz will start and you will have 1 minute per question to answer.

21. Question 1  Name the three plate boundaries.

22. Question 2  If the P-wave arrived at 12:03:00 and the S- wave arrived at 12:07:40, how far away is the EQ epicenter?

23. Question 3  What drive plate movement?

24. Answers  Convergent, Divergent, Transform  3200km  Convection