Evidence of Earth’s Interior - Weebly
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Evidence of Earth’s Interior Direct and Indirect Evidence Earthquakes! Spreading The Energy • Earthquakes are the result of energy being released when rocks move along a fault. • This energy causes the earth to vibrate. • These vibrations are known as seismic waves. Types of Waves Electromagnetic Mechanical Require a medium to travel! Seismic waves are mechanical waves!
Transcript of Evidence of Earth’s Interior - Weebly
Evidence of Earth’s Interior Direct and Indirect Evidence
Earthquakes!
Spreading The Energy• Earthquakes are the result of energy being released
when rocks move along a fault. • This energy causes the earth to vibrate. • These vibrations are known as seismic waves.
Types of Waves
Electromagnetic Mechanical
Require a medium to travel!
Seismic waves are mechanical waves!
Remember Waves??
What’s the Medium?
How does it move relative to the wave?
Let’s explore seismic waves to see how they work!
Recording The Data• A seismograph is a record of an earthquake’s seismic waves.
• Recorded by a seismometer.
What Do They Look Like? Can You “See” The Layers?
Let’s Draw Them!
How thick are the layers?
Evidence of Earth’s Interior Flippy Questions!
Into Which Layer Have We Drilled?
1. Crust
2. Mantle
3. Outer Core
4. Inner Core
How Many Types of Crust Exist?
1. One
2. Two
3. Three
4. Four
What Are They??
Which of the following is the Oceanic Crust?
How Do You Know??
Which of the Following Best Describes a Xenolith?
1. Magma rising to the surface from the outer core.
2. Magma rising to the surface from the mantle.
3. Pieces of unmelted rock rising to the surface
from the outer core.
4. Pieces of unmelted rock rising to the surface
from the mantle.
Why are they Important?
Examples of Xenoliths
Peridotite
What Causes Earth’s Magnetic Field?
1. Large, solid bar magnet in center of the Earth.2. Molten rock rotating in Earth’s interior.3. Liquid iron rotating in Earth’s interior. 4. Scientists still don’t know.
Which Layer Creates the Magnetic Field?
How Do You Make A Magnetic Field?
Moving electrons can create a magnetic field!
The material inside the coil, known as the core material, affects the strength of the magnet.
The best material for making a strong electromagnet is???
Why A Liquid??
The only way to create a field inside the Earth would be to have moving electrons!
The rotation of the Earth causes the liquid to move, creating the electric current needed to
make the magnetic field.
When solid iron gets above the Curie point, it no longer will be magnetized.
Curie Point = 770°C = 1043 K
1. Scientists still don’t know. 2. Made of a material that is more dense than the
surface rocks.3. Made of a material that is less dense than
surface rocks.4. Made of similar rocks as the surface.
Think About Density!
What Type of Material Could It Be??
The average density of Earth is 5.5 g/cm3. The surface rocks have a density of about 2.8 g/cm3. From this, scientists can infer that the core of the Earth is…
What Did You Learn?
Revise Your Model!
Your model should include the following:1. An image of what you believe the interior of
the Earth looks like if you were to slice it in half. •Layer •Thickness •State of Matter •Composition •Density
2. An explanation of your image including why it looks like this.
3. The evidence scientists have for this structure.
Your model should be both qualitative and quantitative!
