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Warm-up Week 15 Day 1

Warm-up Week 15 Day 1. It is generally true that igneous rocks are _______. a. made of silicate minerals. c. easily scratched b. normally contain fossils. d. contain primarily evaporites. Which factors help determine whether a volcanic eruption will be violent or gentle ?

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Warm-up Week 15 Day 1

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  1. Warm-up Week 15 Day 1 • It is generally true that igneous rocks are _______. • a. made of silicate minerals. c. easily scratched • b. normally contain fossils. d. contain primarily evaporites. • Which factors help determine whether a volcanic eruption will be violent or gentle? • a. composition of the magma • b. amount of dissolved gases in the magma • c. temperature of the magma • d. composition of magma, temperature, and gas pressure. • Most intraplatevolcanic activity occurs where ___. • a. hot magma descends into the mantle at a plate boundary • b. oceanic plates diverge • c. oceanic and continental plates converge • d. hot mantle plumes rise toward the surface within a plate

  2. “Orogenesis” “Oro” = mountain “Genesis” = beginning Mountain Building! Chapter 11

  3. Q: How do mountains form? Plate movements push/pull rocks!

  4. Deformation • Forces! • Push or Pull • Change in shape or size. • Happens at plate boundaries

  5. Force & Stress • Stress = strength of push/pullat one area • ↑High stress  Deformation

  6. 3 Types of Stress • Tensional • Pulled apart • Compressional • Pushed together • Shear • Pulled or pushed at opposite edges

  7. Stress at Faults builds Mountains!

  8. 3 Fault Types • Strike-Slip Fault • Normal Fault • Tensional • Fault-block Mtns. • Horst ↑ • Graben ↓ • Thrust Fault • Compression • Folded Mtns.

  9. Review: Convergent Divergent Transverse • 3 plate boundaries • ___________ boundaries • ___________ boundaries • ___________ boundaries • Most mountains at _______________ boundaries. • 3 Convergent Boundaries • ________ - __________ • ________ - __________ • _________- __________ Convergent Volcanoes! Folded Mtns! Oceanic Oceanic Oceanic Continental Continental Continental

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