Subduction and Oceanic Features

Mr. B explains deep ocean trenches and the subduction process that forms them. He discusses how convection currents drive seafloor spreading, which pushes oceanic plates towards continental plates, leading to subduction and trench formation. The video highlights the Puerto Rico Trench as an example of this geological process. The video concludes with a review of the key concepts and encourages students to seek help if needed.

What is the primary geological process responsible for the formation of deep ocean trenches?

• Erosion

• Tectonic uplift

• Volcanic activity

• Subduction

What drives the movement of molten material at the mid-ocean ridge?

• Wind patterns

• Convection currents

• Tidal forces

• Magnetic fields

Where does seafloor spreading primarily occur?

• At mid-ocean ridges

• At oceanic trenches

• At continental shelves

• At volcanic islands

What happens when an oceanic plate collides with a continental plate?

• Both plates remain stationary

• The continental plate subducts beneath the oceanic plate

• The oceanic plate subducts beneath the continental plate

• The oceanic plate rises above the continental plate

Why is the oceanic plate more likely to subduct under a continental plate?

• It is less dense

• It is more dense

• It is thicker

• It is older

What is a notable feature of the Puerto Rico Trench?

• It is the shallowest trench

• It is formed by volcanic activity

• It is located in the Pacific Ocean

• It has a sudden drop-off

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

• Mid-ocean ridge

• Oceanic trench

• Continental shelf

• Volcanic island

What is the depth of the water before reaching the Puerto Rico Trench?

• 25 feet

• 100 feet

• 50 feet

• 10 feet

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

• Erosion

• Subduction

• Sedimentation

• Convection

What should students do if they are still confused about the concept of subduction?

• Ask their teachers for help

• Watch more videos

• Ignore the confusion

• Read a textbook