Transcript Inside the Earth

Inside the Earth
Layers of the Earth
• Crust
• Mantle
-Upper
-Lower
• Core
-Outer
-Inner
The Crust
• Outer layer we live on
• 5-100 km thick
• 2 types of crust
– Oceanic (very dense, made of basalt)
– Continental (less dense, made of granite)
The Layers of the Earth
The Mantle
Mantle split into:
1. Lithosphere:
-solid + rigid
-upper mantle + crust
2. Asthenosphere:
-”plastic”
-rock is hot enough to
flow (asphalt)
-lower mantle
The Core
• Outer Core:
-dense liquid
-iron + nickel
• Inner Core:
-solid
-iron
• Distance to center
~3,947–3,968 mi
Earth’s Layers
• How are the earth’s layers
similar to an egg?
• Shell = crust
• Egg white = mantle
• Yolk = core
How do scientists know?
• Use seismic waves to tell them the
makeup of the deepest parts of Earth.
• Seismic Waves: vibrations that travel
through Earth’s layers.
-change velocities
as they pass through
different layers.
Earth’s magnetic field
•Earth has North and South magnetic poles.
•Results from liquid iron in outer core.
•Creates a magnetic field.
Plate Tectonics and the Mantle