Plate Tectonics I

In the Atlantic ocean, where is the youngest seafloor located?

• Towards the edges, near the eastern and western continents

• Towards the middle of the ocean

• Towards the north and south poles

• Young seafloor is located randomly throughout the ocean

What two words are BEST used to describe how the seafloor spreads?

• Magma and convection

• Earthquakes and convection

• Magma and convention

• Volcanoes and earthquakes

The entire cycle of heating occurring in the mantle is called

• Convection currents

• Compound currents

• heat currents

•  subcurrents

What technology was used during WWII to detect enemy submarines and produce the first map of the seafloor?

• Sonar

• Radar

• GPS

Undersea mountain range.

• Rift

• Mid-ocean ridge

• seafloor spreading

• Continental drift

Process by which new ocean crust forms.

• Seafloor spreading

• Continental drift

• Mid-ocean ridge

• Rift

The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge

• Farthest from the mid-ocean ridge

What are Mid-Ocean Ridges?

• A chain of underwater waterfalls 

• A chain of underwater volcanos

• A chain of underwater mountains

• A chain of underwater rocks

New crust is always formed at the...

• mid-ocean ridge

• deep-ocean trench

• asthenosphere

Seafloor spreading...

• creates new oceanic crust

• destroys or recycles crust

• creates new continental crust

• creates old crust