Convection Currents and Seafloor Spreading

The image shows a mid ocean ridge. What is an important feature of seafloor spreading?

• Mid ocean ridges only occur at convergent boundaries.

• The convection currents in the core drive the plates apart.

• As the plates pull apart, the lava rises to form new crust.

Tags

NGSS.MS-ESS2-1

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 at the mid-ocean ridge

• Towards the north and south poles

• Young seafloor is located randomly throughout the ocean

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NGSS.MS-ESS2-3

Why does the ocean floor sink beneath the continent at Z?

• The ocean floor is less dense than the continent.

• The ocean floor is more dense than the continent.

• The ocean floor is moving faster than the continent.

• The ocean floor is moving slower than the continent.

Tags

NGSS.MS-ESS2-3

Which of the following causes Earth's tectonic plates to move?

• Energy from the Sun

• Magnetic Pole Reversal

• Convection currents in the mantle

• Faults in Mountain Ranges

Tags

NGSS.MS-ESS2-3

According to the hypothesis of seafloor spreading, molten rock is rising up along the ​ (a)  

• mid-ocean ridge

• deep-sea trench

Tags

NGSS.MS-ESS2-3

Seafloor spread occurs because....

• Plates are smashing together and oozing apart

• Magma below the Earth's crust is forced up toward the surface after plates move apart

• Maui is trying to break out of his prison

• The Earth's magnetic poles are reversing

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

The process that creates new seafloor as plates move away from each other at the mid-ocean ridges

• stressing

• seafloor spreading

• subduction

• shearing

There is seafloor spreading occurring at which spot?

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-3

How is it possible for new crust to be formed without increasing the surface area of the Earth?

• Crust is destroyed at the same time it is created

• New crust is underwater where it sinks

• New crust breaks more easily than old crust

Tags

NGSS.MS-ESS2-3

Which of the following objects best represents the movement that occurs during sea-floor spreading?

• Elevator

• Conveyor belt

• Rollercoaster

• Hot air balloon

Tags

NGSS.MS-ESS2-1