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- 1. Multiple Choice
seafloor spreading is occuring at the boundary between
Nazca Plate and South American Plate
Australian Plate and the Eurasian Plate
North American Plate and the Eurasion Plate.
China Plate and the Philippine Plate
- 2. Multiple Choice
What type of boundary does Seafloor Spreading occur?
Convergent
Subduction
Collision
Divergent
- 3. Multiple Choice
One of the longest mountain chains on the planet earth is found between North America and Eurasia. This mountain chain is called the
Rockies
Mid Atlantic Ridge
Ozark Mountains
Pacific Rim
- 4. Multiple Choice
This feature is where the plates rip apart and magma rises to form new crust.
Mid-Ocean Ridges
Trench
Rift Valley
Subduction Zone.
- 5. Multiple Choice
The material that is rising up from the mantle to form new ocean crust is called?
Lava
Slate
Sedimentary Rocks
Magma
- 6. Multiple Choice
If new ocean crust is found around the rift valley, where do you find the olest crust?
Mid Ocean Ridges
Trech at a Subduction Zone
Rift Valley
Magma recycle center
- 7. Multiple Choice
What is the classification of the rock being formed at a rift valley?
Sedimentary
Metamorphic
Foliated
Ingenous
- 8. Multiple Choice
The rocks on the ocean floor show evidence that the magnetism alternates North and South as you move along the sea-floor. This evidence of sea-floor spreading is reflected in the rocks on the ocean floor. The name for this evidence is called?
Crustal subtraction
Magnetic Reversals
plate motion
magnetic soldification
- 9. Multiple Choice
Youngest oceanic crust is found at the Mid-Ocean Ridge. Age gets progressively older as you get farther from the mid-ocean ridge. Why is the Earth not expanding in size?
The older ocean crust is weathered and eroded away
deposition of the older crust decreases the mass of earth
The older crust is being recycled at subduction zones.
The mid ocean ridge is becoming so large that it is consuming the older the crust.
- 10. Multiple Choice
The boundary where you would find a rift valley is called ?
Convergent
Convergent Collision
Divergent
Subduction
- 11. Multiple Choice
The ocean floor was first mapped out using a device called?
sonar
GPS
Naval mapping
Marine topographic mapping
- 12. Multiple Choice
Divergent Boundaries are where two plates are moving in the opposite directions. Rising magma is pushing apart and adding new crust. This is also know as ?
compaction
Rifting
deposition
convergent
- 13. Multiple Choice
Features of a Divergent Boundary are Mid-Ocean ridges, Rift Valley and ?
Earthquakes
San Andreas Fault
Lithosphere
Fissure Volcanos
- 14. Multiple Choice
The ocean floor is made up of what kind of Igneous rock?
Granite
Basalt
Sulfur
Calcite
- 15. Multiple Choice
At mid-ocean ridges, molten material (magma) rises from the mantle and erupts as fissure volcanoes. The molten material then spreads out, pusing older rock to both sides of the ridges. This process is called?
sink holes
Divergent subduction
Subduction zones
Sea-Floor spreading
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