Earth's Layers

Earth's Layers Review

by Luna Beale

​Recap

​1. Share something from winter break.

​2. What did you learn last week?

​3. What are some questions you have from last week?

Multiple Choice

How many layers of the Earth are there?

• 1

• 2

• 3

• 4

Multiple Choice

The center of the Earth is the

• Outer core

• Inner core

• Mantle

• Crust

Multiple Choice

The surface layer is the

• Outer core

• Inner core

• Mantle

• Crust

​The layers

​

• ​​Crust

• Mantle

• Outer core

• Inner core.

Multiple Choice

Which two layers make up the lithosphere?

• crust and outer core

• inner core and outer core

• crust and mantle

• mantle and outer core

​Lithosphere

• ​The lithosphere is the top, solid section of the Earth.

• It is made up by the crust and upper mantle.

• ​It forms the tectonic plates

Multiple Choice

Which of the following describes the asthenosphere?

• The inner core

• The liquid part of the outer core

• the molten part of the mantle

• the hard part of the crust

​Asthenosphere

​The asthenosphere is the lower mantle.

​

​This part of the mantle gets very hot and sometimes the rock is molten.

Multiple Choice

Which layer is completely liquid?

• Crust

• Outer core

• Mantle

• Inner core

​States of Matter

​Lithosphere (crust and upper mantle): solid

​

​Asthenosphere: Plastic

​

​Outer core: Liquid

​

​Inner core: Solid

​Seismic Waves

​Scientists figured this out by looking at the patterns of S and P waves, which are types of seismic waves.

Multiple Choice

If S waves cannot travel through liquid, we should see that S waves stop at which layer?

• crust

• mantle

• outer core

• inner core

​Models

​Models help us study something that is either too big or too small to see.

​

​Sometimes, they are based on something we have never actually seen.

​

​We have never actually seen all of the layers of the Earth, but we are going to make a model to help us study them.

​Directions

1. ​1 member from each team should come up to grab a piece of wax paper with dough.

2. ​Write your names on the wax paper in sharpie. Pass the sharpie back when you are done.

3. ​Follow each step carefully. We will go step by step.

The Inner Core

• ​We will start with the inner core.

• The inner core is a dense ball. It is also the hottest layer.  

• Create this layer by forming a ball of red dough. 

The Outer Core

• The outer core is also very hot, but not quite as hot as the inner core. 

• Form this layer by wrapping orange dough around the inner core. 

The Mantle

• The mantle is the next layer. It is still pretty hot, and it is the thickest layer. 

• Wrap a very thick piece of yellow dough around the other layers. 

The Crust

• This layer is made up of rock and dirt. It is the thinnest layer. 

• Wrap a final, thin layer of grey dough around the other layers. 

Oceans and continents

• Use the blue and green dough to create oceans and continents on the outside of your Earth.

​Clean up

​Place just your wax paper with your model on the blacktop counter. Leave the tray on your table.

​

​Add more wax paper to your tray to prepare for next period.