Download Earth`s Layers – Notes – August 24, 2016

Earth’s Layers – Notes – August 24, 2016
Crust (Solid)
Position: __________________________ layer & Thinnest Layer
Density: __________________dense layer of all
2 types of crust:
________________: thinner, more dense, younger
_________________________: less dense, older rock
Composition:
1. __________________rock
2. Made mostly of Silicon & Oxygen
Oceanic Crust = Contains _____________________ Rock
Continental Crust = Contains ____________________ Rock
Lithosphere (Solid)
Position: Lies between the ___________ and the ___________ Mantle
Features: Broken into pieces called _____________________ Plates &
Floats on top of the _________________________
Asthenosphere (Soft Solid)
Position: Top portion of the Mantle; known as the
____________________________
Features: Moves the ____________________________ plates and is a
____________________ solid
Mantle (Soft Solid)
Position: Middle Layer
Features: ___________________ Layer and contains the
______________________________ that helps move the tectonic plates
Density: Density increases with pressure the deeper you go into
the Mantle.
Composition:
Is a ______________________ solid
Hot, softened rock
Contains Iron and Magnesium
Earth’s Layers – Notes – August 24, 2016
Outer Core (Liquid)
Position: Outer part of the core
Density: Very dense, only less dense than Inner Core
Features: Is the Only _________________ Layer and is responsible for the
___________________________________ that protects our Earth from Solar Wind.
Composition:
Slow-flowing liquid
Mostly Iron and Nickel
Inner Core (Solid)
Position: Deepest layer
Density: Most _______________________ layer
Feature: Has enough __________________ for it to remain as a solid.
Composition:
A spinning solid
Mostly Iron and Nickel
If we can’t reach the Mantle, how do we know what it’s made of??
Scientist track seismic waves (these come from Earthquakes) through the earth’s layers and they examine
materials ejected from volcanic activity, which have helped scientists discover what the MANTLE is made of.
Most lava that comes from volcanoes is actually just melted crust and is not material from the mantle and/or the
core.
So what about the Inner Core and Outer Core?
Scientists know what the inner and outer core are made of (composition) based on the movement of seismic waves
through the layers.
Why is the Inner Core solid?
Even though it is really hot, the weight of all of the other materials above it (crust, mantle, and outer core) put a lot
of pressure on the inner core, keeping it solid!
Why does the Earth have a Magnetic Field?
The magnetic field is caused by the movement of the outer core (flowing liquid).
Write THREE things you learned
1.
2.
3.
Write TWO things you found interesting
1.
2.
Write ONE question you still have about the material
1.