Earth’s LayersEarth’s LayersPages C6-11Pages C6-11

Earth’s LayersEarth’s Layers Crust-where we walkCrust-where we walk Mantle-thickest layer, Mantle-thickest layer, made mostly of solid rockmade mostly of solid rock

Core (Outer and Inner) – Core (Outer and Inner) – deep inside the earth, deep inside the earth, made of iron and nickelmade of iron and nickel

How deep are the layers?How deep are the layers?

Crust: 3-43 miles deepCrust: 3-43 miles deep Mantle: about 1,790 miles Mantle: about 1,790 miles

deepdeep Outer Core: about 1,410 Outer Core: about 1,410

miles deepmiles deep Inner Core: about 750 miles Inner Core: about 750 miles

deepdeep

Which layer is the hottest?Which layer is the hottest?

Inner Core-may be as hot as the sunInner Core-may be as hot as the sun

What are Plates?What are Plates?

Continent-sized slabs that make up Continent-sized slabs that make up the crust and the mantlethe crust and the mantle

Plates are constantly moving, very Plates are constantly moving, very slowlyslowly

Plates Move:Plates Move:

Away from each otherAway from each other Toward each otherToward each other Past each otherPast each other

When Plates Move TogetherWhen Plates Move Together

Mountains or Volcanoes Mountains or Volcanoes are formedare formed

When Plates Move Past When Plates Move Past Each OtherEach Other

Earthquakes occurEarthquakes occur

Railroad tracks after an earthquake.

For DiscussionFor Discussion

What are the three What are the three layers of the earth?layers of the earth?

Crust, Mantle, CoreCrust, Mantle, Core On which layer do we On which layer do we live?live?

CrustCrust

Which is the thickest Which is the thickest layer?layer?

MantleMantle Which layer is the Which layer is the hottest?hottest?

Inner CoreInner Core

How often do earth’s How often do earth’s plates move?plates move?

They are in constant They are in constant motion.motion.

At what speed do they At what speed do they move?move?

Slowly (only a few Slowly (only a few centimeters per year)centimeters per year)

What is formed when What is formed when plates move together?plates move together?

Mountains and VolcanoesMountains and Volcanoes What happens when What happens when plates slide past each plates slide past each other?other?

Earthquakes occur.Earthquakes occur.