Download - Warm-upWeek 15Day 1
Warm-up Week 15 Day 11. It is generally true that igneous rocks are _______.• a. made of silicate minerals. c. easily scratched • b. normally contain fossils. d. contain primarily evaporites.
2. 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.
3. Most intraplate volcanic 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
“Orogenesis”“Oro” = mountain
“Genesis” = beginning
Mountain Building!
Chapter 11
Q: How do mountains form?
Plate movements push/pull rocks!
Deformation• Change in shape or size.• Happens at plate boundaries
Forces!Push or Pull
Force & Stress
• Stress = strength of push/pull at one area
• ↑High stress Deformation
3 Types of Stress
1. Tensional– Pulled apart
2. Compressional– Pushed together
3. Shear– Pulled or pushed at
opposite edges
Stress at Faults builds Mountains!
3 Fault Types1. Strike-Slip Fault
2. Normal Fault– Tensional– Fault-block
Mtns.• Horst ↑• Graben ↓
3. Thrust Fault– Compression– Folded Mtns.
Review:• 3 plate boundaries
• ___________ boundaries• ___________ boundaries• ___________ boundaries
• Most mountains at _______________ boundaries.
• 3 Convergent Boundaries• ________ - __________• ________ - __________• _________- __________
Convergent
Divergent
Transverse
Convergent
Oceanic Oceanic
Oceanic Continental
Continental Continental
Volcanoes!
Folded Mtns!