Earth's Layers and Structure

What are the two varieties of Earth's crust?

• Continental and oceanic

• Mafic and felsic

• Silica and iron

• Cratons and xenoliths

Which layer of Earth's crust is mafic?

• Continental

• Oceanic

Which layer of Earth's crust is felsic?

• Continental

• Oceanic

Tags

NGSS.MS-ESS2-1

Which type of crust is more dense, oceanic or continental?

• Oceanic crust

• Continental crust

• They have the same density

• It depends on the location

What is the main process by which oceanic crust is destroyed?

• Subduction

• Convection

• Erosion

• Volcanism

Tags

NGSS.HS-ESS1-5

What is the main force that causes plate tectonics?

• Slab pull

• Mantle plumes

• Volcanic eruptions

Tags

NGSS.MS-ESS2-3

What is the main component of Earth's mantle?

• Peridotite

• Olivine

• Kimberlite

• Xenolith

Diamonds form

• Deep below the surface in mafic rocks.

• Close to the surface in felsic rocks.

What is the main component of Earth's outer core?

• Iron and nickel

• Peridotite

• Olivine

• Kimberlite

What is the process by which Earth maintains its magnetic field?

• Geodynamo

• Convection

• Subduction

• Crystallization