Layers of the Earth

The thinnest layer of the Earth is the ___________.

• mantle
• crust
• core

There are how many different types of crust?

• 1
• 2
• 5
• 3

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

Why is the inner core solid?

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

Which layer of Earth has the GREATEST density?

• crust
• mantle
• outer core
• inner core

Which letter in the diagram identifies the layer of Earth made up of solid nickel and iron?

• layer A

• layer B

• layer C

• layer D

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 Earth's layers is best described as liquid metal?

• crust

• mantle

• outer core

• inner core

What is the core made of?

• steel
• iron 
• aluminum
• iron and nickel