Topic:

Inferred Properties of Earth’s Interior

Crust

Mantle

Outer Core Inner

Core

Simple Model of Earth’s

Interior

ESRT page 10

***All Interior info is

based on: Studying

Seismic (earthquake)

waves

The Crust

Mantle

Thic

ke

r

Thin

ne

r

Felsic &

mostly

granite

Thicker

Thinner

Continental Crust vs. Oceanic Crust

Continental: Oceanic:

-Thick -Thin

-Felsic -Mafic

-Lower density -Higher density

-Mostly Granite -Mostly Basalt

What is the Moho?

MOHO- Mohorovicic Discontinuity:

– boundary between crust & mantle

Andriji Mohorovicic. 1909

Density Increasing

Depth

Increasing

Density

What section of crust is shown in the diagram?

What is the Lithosphere?

Lithosphere - crust & rigid mantle

- divided into sections “plates”

What is the Asthenosphere?

Asthenosphere • Partially melted layer of mantle

• Convection moves lithospheric plates

Mid-Atlantic Ridge in Iceland (J. Parkinson)

Over the Mid-Atlantic Ridge To North

America

To Europe

J. Parkinson Mid-Ocean Ridge Video Clip

Diverging Plates

Fill in on ESRT

Converging Plates

What is the Mantle?

Thickest

layer of

the

Earth

What is the Outer Core?

Outer

Core

What is the Inner Core?

Inner

Core

Earth’s Core is:

• Similar to meteorites

• Origin of Earth’s magnetic field – iron & nickel magnetic elements

ESRT pg 10

More on the Interior

Surface of Earth

Center of Earth

Radius of Earth = 6378 KM

Sample Question:

1. What is the depth of the outer and inner core boundary?

5100 km (remember units!!!)

Represents the Pressure at different depths

2. What is the pressure at the mantle and outer core boundary?

1.5 million atm.

Line represents the temperatures inside the earth

3. What is the temperature at the lithosphere and asthenosphere boundary?

1000°C

This dotted line shows the melting point of material in the Earth. What does melting point mean?

-From Solid to a Liquid

If the temperature is above the melting point, what phase is it in?

-Liquid

4. Which layer(s) of Earth is in the liquid phase?

Outer Core

Solid

Solid

Solid

Liquid

Solid

Solid

Solid

Liquid

FQ:

• Which type of crust is the densest?

Practice

Earth’s

Interior

Crust

_____________

_____________

__________

__________

Density: _______________

Temp: _________________

Pressure: ______________

__________

1. _________

2. ________

1. Lithosphere

2. Asthenosphere

Density: ____________

Temp: ______________

Pressure: ___________

Density: ____________

Temp: ______________

Pressure: ___________

_______________ Density: _9.9-12.2_

Temp: ______________

Pressure: ___________

_______________ Density: ____________

Temp: ______________

Pressure: ___________

Use ESRT pg 10 and your knowledge to help you fill in this information.