Seafloor Spreading

Massive pieces of land that are part of the Earth's crust and upper mantle

• Tectonic plates
• Trenches
• Divergent boundary
• Continental shelves

Which of the following supports the theory of seafloor spreading?

• Correlation of rock layers
• Crustal Age
• Magnetic Reversal
• Continuous Mountain Chains

What causes the crust to move?

• convection
• conduction
• tension
• radiation

The zone where one plate slides under another is called the

• Convergent zone
• Subduction zone
• Transform zone
• Mantle zone

The entire cycle of heating occurring in the mantle is called

• Convection currents
• Compound currents
• heat currents
•  subcurrents

When looking at mid ocean ridges the oldest rocks are 

• In the middle
• Found close to the rift zone
• Found far from the mid ocean ridges

What 3 kinds of evidence were used to prove that the seafloor spread?

• Pillow lava, age of rocks, WWII shipwrecks
• Age of rocks, magnetic seafloor stripes, WWII ship logs
• Pillow Lava, magnetic seafloor stripes, age of rocks

When one tectonic plate __________ under another at a convergent boundary it sinks back in the mantle.

• subducts
• falls
• sinks

What technology was used during WWII to detect enemy submarines and produce the first map of the seafloor?

• Sonar
• Radar
• GPS

Undersea mountain range.

• Rift
• Mid-ocean ridge
• seafloor spreading
• Continental drift