Earth's Layers & Plate Tectonics

Earth's Layers

Mantle, Outer Core, Inner Core, Crust

Earth's Layers

• Earth is a sphere with 4 different layers.

• These layers are: Crust, Mantle, Outer Core, & Inner Core.

Earth's Crust

• The crust is its rocky outer layer.

• It is hard and made of many minerals.

• The crust is the thinnest in the ocean and thickest under mountains.

• This layer moves around on plates.

• This layer can be 3 to 43 miles thick.

Earth's Tectonic Plates

• The Earth's crust is broken into plates.

• These plates are able to move due to the warm mantle under them.

• The interaction between plates is what creates the landforms on the Earth's surface.

Earth's Mantle

• This is the thickest layer, making up 2/3 of the Earth's mass.

• The mantle has some liquid rock but is mostly solid.

• High temperatures and pressure cause it to move like warm plastic.

• It is approximately 1,790 miles thick.

Earth's Core

• At the center of the Earth, there is the core.

• It is mostly made of metal.

• It has two parts: Outer and Inner.

• This layer is very hot.

Earth's Outer Core

• The outer core is molten, liquid metal.

• It is extremely hot and is able to move.

• The outer core is approximately 1,410 miles thick.

Earth's Inner Core

• The inner core is made of solid metal- iron and nickel.

• These metals are the reason the Earth has a magnetic field.

• The inner core is approximately 750 miles thick.

Multiple Choice

What layer is shown by letter D?

• Crust
• Mantle
• Outer core
• Inner core

Multiple Choice

What layer is shown by letter C?

• Crust
• Mantle
• Outer core
• Inner core

Multiple Choice

What layer is shown by letter B?

• Crust
• Mantle
• Outer core
• Inner core

Multiple Choice

What layer is shown by letter A?

• Crust
• Mantle
• Outer core
• Inner core

Multiple Choice

How does temperature change as you move from the crust to the core?

• it gets cooler
• it gets hotter
• it stays the same
• the core is frozen

Multiple Choice

Which layer of the earth is a pure liquid?

• crust
• mantle
• outer core
• inner core

Multiple Choice

What is the correct order (starting from the surface) of Earth's layers?

• crust, mantle, inner core, outer core
• mantle, outer core, inner core, crust
• inner core, outer core, mantle, crust
• crust, mantle, outer core, inner core

Multiple Choice

Earth's inner core is

• a layer of hot rock
• a solid ball of iron and nickel
• a layer of liquid iron and nickel
• a layer of rock that forms Earth's outer skin
  

Multiple Choice

True or False. The Earth's land forms are found on Earth's crust.

• True
• False

Multiple Choice

True or False. The Earth's crust is made of rock

• True

• False

Multiple Choice

True or False. The Earth's crust is made of rock

• True

• False