Convection Currents and Seafloor Spreading

Which is NOT evidence of sea-floor spreading?

• Molten magma constantly erupting

• Drilling samples of rock

• Magnetic stripes

• Fossil evidence

Most geologist think that the movement of Earth's tectonic plates is caused by

• the rotation of the Earth.

• the Earth's magnetic field.

• subduction in the mantle

• convection currents in the mantle (asthenosphere)

• convection currents in the lithosphere

Tags

NGSS.MS-ESS2-3

The youngest rocks on the seafloor are located near the_____.

• seafloor

• mid-ocean ridge

• trenches

• Perkiomen valleys

Tags

NGSS.MS-ESS2-3

The process by which new seafloor forms when magma rises at the mid-ocean ridges and solidifies, pushing older rock away is called _____.

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Which of the following causes the landmasses to move? Choose all that apply.

• continental drift

• seafloor spreading

• convection currents

• Earthquakes

• Volcanoes

Tags

NGSS.MS-ESS2-3

What features are associated with Seafloor spreading? Choose all that apply.

• rift valley

• subduction

• mid-ocean ridge

• volcanoes

Two plates are pulling apart, magma comes up through the gap between in the plates called the ______, located in the middle of the _____. This process is called ___.

• mid-ocean ridge, rift valley, continental drift

• rift valley, mid-ocean ridge, continental drift

• mid-ocean ridge, rift valley, seafloor spreading

• rift valley, mid-ocean ridge, seafloor spreading

Tags

NGSS.MS-ESS2-1

Ocean crust is created at the ______ and destroyed at the _____.

• trenches, rift valleys

• mid-ocean ridges, rift valleys

• mid-ocean ridges, trenches

• trenches, mid-ocean ridges

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Warmer material in the convection current rises because it is ______ dense.

Tags

NGSS.MS-PS1-4

What is the primary force that drives the movement of tectonic plates according to the theory of seafloor spreading?

• Convection currents in the mantle

• Earth's magnetic field

• Gravitational pull from the moon

• Solar radiation

Tags

NGSS.MS-ESS2-3