Seafloor Spreading

What is seafloor spreading?

• Mid-ocean ridges continually add new material to the ocean floor.

• When a plate in the ocean moves down into the lithosphere.

• Rifts

• When continents push together.

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

What is subduction?

• Where the magma rises above a plate.

• Where a plate sinks beneath another and back into the mantle.

• Where magma is pushed out from the rift.

• The currents that magma moves through.

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

Seafloor spreading is where new oceanic crust is formed through and then gradually moves away from the ridge.

• True

• False

Tags

NGSS.MS-ESS2-3

The farther from a mid-ocean ridge a rock sample is taken, the _______ the rock is.

Tags

NGSS.MS-ESS1-4

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 ocean ridges.

• Towards the north and south poles.

• Young seafloor is located randomly throughout the ocean.

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

Which of the following was used as evidence to support the idea of seafloor spreading?

• Age of rocks

• Rock formations

• Fossils

• Glacier deposits

• All of the above

Tags

NGSS.MS-ESS2-3

What drives tectonic plate movement?

• gravity

• ocean waves

• subduction

• convection currents

According to Wegener's hypothesis of continental drift,

• Earth's surface is made up of seven major landmasses.

• the continents DO NOT move

• Earth is slowly cooling and shrinking

• The continents were once joined together in a single landmass

What is Pangaea?

• The name of a scientist

• the name of the super-continent that existed millions of years ago

• another name for continental drift

• the name of an ancient fossil

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

Label the following: Rift, Subduction, Magma, Heat, Cool, Slab Pull, Plate

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

NGSS.MS-ESS2-1