PROCESSES AND LANDFROMS ALONG PLATE BOUNDARIES

Which of the following is TRUE about Subduction?

• It is the process by which one of the oceanic crust subducts under the overriding plate.

• It is the process by which one of the oceanic crust dives down towards the mantle.

• It is the process by which one of the oceanic crust moves under less dense material.

• All of these.

Which of the following does NOT belong to the group?

• Mountain Ranges

• Earthquake

• Tsunami

• Volcanic activity

The area where one of the lithospheric plates moves towards the mantle is called _______________ __.

• Tension Zone

• Subduction Zone

• Rift Valley

• Mid-Ocean Ridge

Seafloor spreading occurs at ______________.

• Constructive Plate Boundary

• Destructive Plate Boundary

• Conservative Plate Boundary

• Sliding Plate Boundary

Fault Valley located undersea is called _____________.

• Undersea Fault Valley

• Trench

• Undersea Canyon

• Ridge

Why are tsunamis likely to occur at oceanic-oceanic convergent boundaries?

• Because magma rises between plates

• Due to horizontal sliding of plates

• Because of subduction and underwater earthquakes

• Due to the formation of rift valleys

Why is no subduction observed at continental-continental convergence?

• Both plates are dense

• Both plates resist downward motion

• One plate is less dense

• Seafloor spreading occurs instead

At divergent boundaries, what happens to the ocean basin over time?

• It narrows

• It disappears

• It widens

• It remains unchanged

Why is the Earth not getting bigger despite the fact that molten materials are gradually coming out from the mid-oceanic ridge?

• Because everything is being consumed in the subduction zone.

• Because of the faster rate of movement of materials from the ridge.

• Because older oceanic materials are pushed away and slowly consumed in the subduction zone.

• Because the rate of coming out of new oceanic materials and destruction of older oceanic crust are the same.

What happens to old seafloor at divergent boundaries?

• It melts and becomes magma

• It is pushed aside by new materials

• It subducts beneath continental crust

• It forms mountain ranges