Seafloor Spreading and Continental Drift

Process by which new ocean crust forms.

• Seafloor spreading

• Continental drift

• Mid-ocean ridge

• Rift

The zone where one plate slides under another is called the

• Convergent zone
• Subduction zone
• Transform zone
• Mantle zone

The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge

Sea-floor spreading begins at the

• Deep ocean trench

• Mid-ocean ridge

• Continent's edge

Older crust is found towards the...

• Mid-ocean ridge
• Deep-ocean trench
• Asthenosphere

Tags

NGSS.MS-ESS2-3

Why does oceanic crust sink below the continental crust during subduction

• oceanic crust is less dense

• oceanic crust is more dense

• oceanic crust is older

• oceanic crust is warmer

Tags

NGSS.HS-ESS1-5

The youngest rocks on the ocean floor are located ____.

• near continents

• at mid-ocean ridges

• far from mid-ocean ridges

• near Asia

Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____.

• century

• year

• day

• decade

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Seafloor spreading occurs because ____.

• new material is being added to the asthenosphere

• earthquakes break apart the ocean floor

• sediments accumulate at the area of spreading

• molten material beneath Earth's crust rises to the surface

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-3

What particular event is shown on the picture?

• mid-ocean ridge

• subduction zone

• transform boundary

• divergent boundary