Continental vs. Oceanic Crust

Which of the following describes a continental crust?

• mostly made of granitic rocks

• mostly made of basaltic rocks

• felsic and less dense

• mafic and denser

Which of the following describe an oceanic crust? Select all that apply

• Oceanic crust is constantly formed at mid-ocean ridges

• Oceanic Crust is mostly composed of different types of granites.

• Mostly stays intact even when plates move apart

• Oceanic crust is dense, almost 3 grams per cubic centimeter

The ________ crust is denser as it has basalt rock.

• oceanic

• continental

• tectonic plates

Granite rock is a ________________________

• less dense rock

• very dense rock

• it is same as mantle basalt

In the image, the plate that goes down the upper mantle is what type of crust and why?

• continental: it is less dense

• continental: it is denser

• oceanic: it is less dense

• oceanic: it is denser

Subduction zone is the point where

• the lighter plate moves under the heavier plate

• the denser (heavier) plate moves under the less-denser (lighter) plate.

• the two plates are rubbing past each other

Name the layers as seen in the image

• magma, oceanic crust, plates and core

• outcore, inside core, mantle and crust

• Crust, mantle, outer-core, inner-core

Continental crust is rarely destroyed and recycled in the process of subduction, therefore some sections of continental crust are nearly as old as the Earth itself.

• True

• False