Earth's Layers

What is the outermost layer of the Earth?

• crust
• mantle
• outer core
• inner core

Which is thicker, continental or oceanic crust?

• continental
• oceanic

What layer of the mantle is flexible like plastic?

• lithosphere
• asthenosphere
• lower mantle

What layer of the mantle breaks into plates and is like the crust?

• lithosphere
• asthenosphere
• lower mantle

Which part of the core is liquid metal?

• outer core
• inner core

What two metals make up the core?

• aluminum and silver
• iron and nickel

Which layer is solid and made of iron and nickel?

• crust

• mantle

• inner core

• outer core

Which layer has strong convection currents that are responsible for the movement of the crust?

• lithosphere: the crust and upper mantle

• asthenosphere: the middle mantle

• outer core

• inner core

What is the order of Earth's layers from most dense to least dense?

• crust, mantle, outer core, inner core

• crust, outer core, mantle, inner core

• inner core, outer core, mantle, crust

• inner core, outer core, crust, mantle

Why is the inner core believed to be solid?

• because iron and nickel are always solid

• because nickel is not dense

• because it has immense pressure on it by all the layers above it and cannot expand or flow

• because it is mostly made of granite and basalt, two solid substances