Seafloor spreading

The OLDEST seafloor 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 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

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

• subducts
• falls
• sinks

The oceanic crust is pushed aside on both sides of the 

• Continent's edge
• Deep-ocean trench
• Mid-ocean ridge

New crust is always formed at the...

• mid-ocean ridge
• deep-ocean trench
• asthenosphere

Process by which new ocean lithosphere forms.

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

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

• Tectonic plates
• Trenches
• Divergent boundary
• Continental shelves

The zone where one plate slides under another is called the

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

Which type of crust is more dense and thinner?

• Continental
• Asthenosphere
• Oceanic
• Byers