1. Finding Information to complete the worksheets
COLUMN 1
On this PowerPoint are several pictures for you to use in filling out the “Sketch” section of your worksheets.
N://8thgrade/Hawkins/Geologic Features Chart.ppt or
To find information on the different features and types of plate boundaries go to Pages 52 to 64 of your Interactive Notebook.
To look up a definition, you can use a dictionary.
I highly recommend using dictionary.shtml
COLUMNS 3 - 5
COLUMN 2

2. Deep Ocean Trench
Definition: long, narrow, deep depression that runs parallel to a convergent plate boundary
Boundaries Possible: Convergent Ocean-ocean & convergent ocean- continent boundaries.
Occurs when an oceanic plate is pulled down into mantle and is remelted.
Examples California Trench, Peru-Chili Trench, and Aleutian Islands Trench

3. Eathquake Definition: Trembling of the Earth Boundaries Possible: All
How it occurs: Sudden release of energy. Subsurface rock units break apart to form faults.
Examples: San Francisco Earthquake, 2005 Fukijama, Japan Earthquake, and Virginia Seismic Zone Earthquake.

4. Fault
Definition: A fracture in rock along which movement has happened.
Boundaries Possible: All
How it occurs: Subsurface rock units break apart from the sudden release of energy.
Examples: San Andreas Fault, Alpine Fault, and Baikal Rift Fault.

5. Fracture Zone
Definition: Linear ocean feature found near the Mid Ocean Ridge.
Boundaries Possible: Divergent Oceanic-oceanic Boundary.
How it occurs: Segments of rock break apart as the mid ocean ridge forms.
Examples: Blanco Fracture Zone, Mendocino Fracture Zone, and Savanco Fracture Zone.

6. Mid Ocean Ridge DEF: Elevated area of sea floor with active volcanism
Divergent Oceanic Boundary ONLY
Magma erupts through cracks in ocean floor and makes the sea floor spread apart
Mid Atlantic ridge, East Pacific Rise, Indo-Australian Rise, Pacific-Antarctic Ridge

7. Non-Volcanic Mountain Ranges
Higher elevation area (bigger than hills)
Convergent Continental Boundary
Continental Crust is pushed up from both sides
Himalayas, Appalachians, Alps

8. Rift Valley Valley with normal faults caused by tension on both sides
Divergent Continental (ONLY)
Continental Crust is pulled apart and middle “drops down” forming large flat valleys with steep sided cliffs
Examples:
East African Rift Valley
Rio Grande Rift Valley
Baikal Rift

9. Subduction Zone On line at geology.com or in your textbook glossary
Convergent with Oceanic Crust
Old Oceanic crust is forced beneath the Earth’s crust and is re-melted in the mantle
Examples
Cascadian Subduction Zone
Peru-Chili Subduction Zone
Aleutian Subduction Zone

10. Tsunami
A large gravity wave produced by a sudden displacement of a large volume of water
Can occur at any boundary under the water
Sudden displacement of a large volume of water causes a rapid rise or fall in the elevation of water. Waves can travels up to thousand’s of miles. Close to shore, tsunami waves become deadly.
Some Famous Tsunamis:
2004 Christmas Day Tsunami
2011 Tohoku Tsunami
1964 Alaska Tsunami

11. Volcanic Island Arc
On line at geology.com or in your textbook glossary
Convergent Oceanic-Oceanic Plate Boundary
Chain of volcanic islands form parallel to a deep ocean trench (above the subducting plate) as molten rock rises and erupts at the surface
Kuril Islands, Philippine Islands, Japan

12. Volcanic Mountains (Volcanic Mountian Range)
A line of active volcanic mountains running parallel to an off shore deep ocean trench
Convergent Oceanic-Continental Plate Boundary
Volcanic mountain ranges form parallel to a deep ocean trench (above the subducting plate) as molten rock rises and erupts at the surface
Cascade Mountains (Mt. St. Helens)

13. Volcano A vent in Earth’s crust through which lava is expelled.
Convergent Plates boundaries with oceanic crust, All Divergent plate boundaries and hot spots
Molten rock (magma) rises through solid rock (because it is less dense) and erupts at he surface as lava
Famous Examples of Volcanoes
Mt. Tambora (Indonesia, 1816) Killed 92,000
Mt. Krakatoa (Indonesia, 1883) Killed 36,000 and completed removed the island of Krakatoa from the world map
Nevado del Ruiz (Columbia, 1985) Killed 23,000