Seafloor Spreading Practice

What is the process by which new ocean floor is created at the mid-ocean ridge and causes the continents to "drift"?

• Continental drift

• Subduction

• Mid-ocean ridge

• Seafloor spreading

What does "subduction" refer to?

• Process of magnetic reversal

• Formation of pillow rock

• Rising of crust from the mantle

• Sinking of crust from the mantle

Tags

NGSS.MS-ESS2-3

What is a mid-ocean ridge?

• Chain of undersea mountains

• Collection of icebergs

• Cliff along the coast

• Volcanic island chain

Tags

NGSS.MS-ESS2-3

What process occurs at trenches?

• Convection currents

• Continental drift

• Subduction

• Seafloor spreading

Tags

NGSS.HS-ESS1-5

The ______________ includes the crust and upper mantle. It is rigid.

• Mountain range

• Outer core

• Asthenosphere

• Lithosphere

What are the two types of crust?

• Oceanic crust and seafloor crust

• Asthenospheric crust and oceanic crust

• Oceanic crust and continental crust

• Plastic crust and ceramic crust

The rocks are younger the further they are from the mid-ocean ridge.

• True

• False

Tags

NGSS.MS-ESS2-3

Oceanic crust will subduct under continental crust because

• their densities are the same

• oceanic crust is more dense

• continental crust is more dense

Check ALL forms of evidence supporting the theory of seafloor spreading

• Fossils

• Pillow rock

• Drilling samples of rock ages

• Magnetic stripes on the ocean floor

Tags

NGSS.MS-ESS2-3

What is the longest mountain chain in the world?

• The Himalayas

• The Andes

• The Alps

• The mid-ocean ridge