Review Presentation for February Test

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Click on the arrow inside this circle to begin. Then elect the “ full screen option here. Then use the “ down arrow ” on your keyboard to view the slides.

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IMPORTANT: There is NO substitute for being in class! Many of these slides will not make sense to you if you weren ’ t in class to hear the explanations and questions. When you are finished going through the slides, press the escape key on your key- board.

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Volcanic Obsidian (Glassy) Volcanic Pumice Scoria (Vesicular) Volcanic Rhyolite Andesite Basalt (Fine-grained) Plutonic Granite Diorite Gabbro (Course-grained) Augite Hornblende Questions about the lab? Go to . . . www.formontana.net/igrocks.html

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Next: About the test (Select the lime green hyperlinks as the appear.):

Next: About the test (Select the lime green hyperlinks as the appear.) 50 multiple-choice questions Including 17 where you will be looking at rocks

Crown Butte near Simms:

Crown Butte near Simms

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Magma moved through the dike into the laccolith. Laccolith Sedimentary (yellow) layers are domed upward. The magma hardens . Surface of the land The Cliffs of Crown Butte Over millions of years, the rock over and around the laccolith is eroded away.

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Porphyry

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Volcanoes/volcanism Types of volcanism, examples Hazards, examples Noteable volcanoes Volcanic formations (NE) Plutonic Formations (NE) Formation of minerals (and crystals) Igneous Rocks Next: Crystals, and then the rocks Test Topics

Honors students will also have three more questions.:

Honors students will also have three more questions. Question about Crown Butte (explain) Question about “ How fast has the Pacific Plate been moving? ” (measure and calculate) Question about plutons (diagram p. 277)

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4 ways that minerals form? (see recent notebook entry)

What to study:

NEXT: The Rocks What to study www.formontana.benson.html unit 6 Notebook entries since January 29 WS: Intro to Volcanoes Video Guide: Volcanoes Lab : What happened at Lake Nyos ? NOVA: Mystery of the Megavolcano Lab: Magma and Lava Activity: Igneous Rocks

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17 questions out of the 50

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Rhyolite Granite Andesite Diorite Basalt Gabbro NEXT: Sample Questions

NEXT:

NEXT Get in groups of 2-3 and use the lab WS from Tuesday to study the rocks. The rock trays are on your table. (include porphyry, but not obsidian) If you are confused, ask for help.

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W Which one was formed as lava cooled above the surface? Which one is what the mountains between Helena and Butte are made of? Which rock contains more quartz? Which one is “ volcanic ” ? Which one is the gabbro? Which of the plutonic rocks on this tray is made of the same minerals as basalt?

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X Which one is the Andesite? Which one is fine-grained? Which one is volcanic? Which one is the diorite?

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Y What are the names of these three? Which one is used in LAVA Soap? Which was used to make arrowheads? Which one experienced two rates of cooling? Which one is most similar to the rock that makes up Crown Butte

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Z BACK Which are the names of these three rocks? Which one contains the same minerals as granite? Which one was formed as magma cooled slowly beneath the surface? Which one would be described as coarse-grained? Which one is “ plutonic ” ?

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Volcanic Pile

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Shield Cones

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The Gorge Lava Flow

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BACK

The “Belt”:

The “ Belt ” Sill

This is NOT a “sill”.:

This is NOT a “ sill ” .

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9

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Batholith

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“ Camping ” on El Cap

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Volcanic Neck?????

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NEXT

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80-40 mya

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BACK

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