Layers of the Earth

Sally is researching the differences that exist in each layer of the Earth. Which of the following best describes Earth's crust?

• Solid, rocky

• Liquid, metallic

• Semisolid, convecting

• Dense, extremely hot

Which of the following is true regarding the composition of the lithosphere?

• The lithosphere is mostly liquid, with some medium-density materials, such as silicon.

• The lithosphere is more plastic and flows slowly compared to the solid crust of Earth.

• The lithosphere includes the core and the lower portion of the mantle.

• The lithosphere includes the crust and the uppermost portion of the mantle, which is sold and rigid.

What letter in the diagram identifies the layer that is composed of moving continental and oceanic plates?

• layer A

• layer B

• layer C

• layer D

What does layer D show?

• upper mantle

• lower mantle

• outer core

• inner core

Which of the following correctly lists the layers from innermost to outermost?

• inner core, outer core, lower mantle, upper mantle, crust

• lower mantle, upper mantle, crust, inner core, outer core

• lower mantle, inner core, upper mantle, outer core, crust

• crust, inner core, lower mantle, upper mantle, outer core

The thinnest layer of the Earth is the ___________.

• mantle
• crust
• core

What is the thickest layer of the Earth?

• the crust
• the mantle
• the outer core
• the inner core

What is the core made of?

• steel
• iron 
• aluminum
• iron and nickel

What describes the outer core?

• solid
• liquid
• viscous
• gas

Why is the inner core solid?

• its unknown
• what it's made of
• the pressure
• it is colder than the outer core