SEAFLOOR SPREADING

Sea floor spreading occurs at the divergent plate boundaries.

• False

• True

• Very False

• Sometimes True

Seafloor spreading begins at the ______.

• Continents edge

• Deep ocean trench

• Mid-oceanic ridge

• Subduction zone

The oceanic crust ____ when it reaches the continental crust.

• sinks

• rises

• expands

• stays

What process happens when oceanic crust and continental crust converge?

• creation of new ocean floor

• rising of molten materials

• seafloor spreading

• subduction

What type of plate boundary exhibited in seafloor spreading?

• Convergent

• Transform Fault

• Divergent

• Oblique

They proposed the SEAFLOOR SPREADING THEORY as suggestion to continental drift theory.

• Inge Lehmann & Harry Hess

• Robert Dietz & Harry Hess

• Alfred Wegener & Robert Dietz

• Alfred Wegener & Inge Lehmann

All of the following findings support the Seafloor Spreading Theory except ____.

• Rocks are younger at mid-ocean ridge.

• Rocks are older at mid-ocean ridge.

• Rocks far from ocean ridge are older .

• Rocks at the ocean floor are younger than those at the continents.

New crust is always formed at the _____.

• mid-ocean ridge

• subduction zone

• trench

• convection zone

In what year the seafloor spreading theory was proposed?

• 1975

• 1970

• 1960

• 1950

Seafloor spreading is a process that creates new __________ crust.

• continental

• convergent

• oceanic

• volcanic