Ocean Floor and Plate Tectonics

What are mid-ocean ridges?

• Underwater trenches formed by volcanic activity.

• Underwater caves formed by erosion.

• Underwater mountain ranges formed along tectonic plate boundaries.

• Underwater valleys formed along tectonic plate boundaries.

Which oceanic feature is formed by the convergence of two tectonic plates?

• subduction zone

• rift valley

• mid-ocean ridge

• continental shelf

What is the process called when one tectonic plate moves beneath another?

• collision

• divergence

• subduction

• convergence

Which type of plate boundary is associated with the formation of new oceanic crust?

• Divergent plate boundary

• Convergent plate boundary

• Transform plate boundary

• Subduction zone

What are trenches?

• Wide, shallow ditches or excavations in the ground

• Underground tunnels used for transportation

• Raised mounds of dirt or rocks in the ground

• Long, narrow ditches or excavations in the ground

Which oceanic feature is formed by the subduction of one tectonic plate beneath another?

• rift valley

• mid-ocean ridge

• seamount

• trench

What causes the movement of tectonic plates?

• Volcanic eruptions

• Convection currents in the Earth's mantle

• Friction between the plates

• Gravitational pull from the moon

Which type of plate boundary is characterized by the separation of tectonic plates?

• Transform plate boundary

• Subduction plate boundary

• Divergent plate boundary

• Convergent plate boundary

What is the term for the boundary between two tectonic plates that are moving towards each other?

• convergent boundary

• transform boundary

• divergent boundary

• subduction boundary

When plates move past each other

• convergent boundary
• divergent boundary
• subduction zone
• transform boundary