Seafloor Earth and Space

What causes the crust to move?

• convection
• conduction
• tension
• radiation

Which of the following supports the theory of seafloor spreading?

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

The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge

Which ocean has the OLDEST seafloor? 

• Pacific Ocean
• Atlantic Ocean

The THICKEST sea floor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge

True or False : Sea-floor Spreading adds new material to the ocean floor?

• True
• False

What evidence helps scientists show how sea floor spreading occurs?

• Ocean Floor Material
• Magnetic Stripes
• Drilling Samples
• All of the Above

What happens when Subduction occurs?

• Parts of the crust fall into the mantle
• Parts of the crust fall into the core
• Parts of the crust fall into space
• None of the Above

What are Mid-Ocean Ridges?

• A chain of underwater waterfalls 
• A chain of underwater volcanos
• A chain of underwater mountains
• A chain of underwater rocks

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

• subducts
• falls
• sinks