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The properties of a rheid represent essentially all Earth materials: they behave elastically over short time scales and plastically over long time scales. In this demonstration, silly putty is used to help explain these properties as well as the yield strength of a material. Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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This demonstration elucidates the concept of propagation of compressional waves (primary or P waves) and shear waves (secondary or S waves), which constitute the seismic waves used in locating and modeling earthquakes and underground nuclear explosions, and for imaging the interior structure of the Earth. The demonstration uses a slinky, pushed along its axis to create a compressional (longitudinal) ... Full description.
Grade level: College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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This demonstration of how seismic waves reflect when they encounter a change in rigidity or incompressibility requires a helper to hold one end of a stretched-out slinky as stiffly as possible. The helper represents a material with a much greater rigidity than the slinky; waves can then be sent and reflected along the slinky. The site also discusses a demonstration of reflection from a less rigid ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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This site describes a demonstration of how the interference of seismic P (primary, compressional) and S (secondary, shear) waves cause standing waves such as surface waves in the Earth. The demonstration focuses on the P and S waves that are bouncing back and forth in the vertical direction in the Earth. Using a slinky, different frequencies are used to create different modes of standing waves. The ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This participatory demonstration of the influence of rigidity on the speed of seismic waves helps students understand the relationship between the speeds of seismic P and S waves and the rigidity (the resistance to shear deformation) and incompressibility (resistance to compression) of the medium. The demonstration requires only a watch or stopwatch. To create the waves, students stand side-to-side ... Full description.
Grade level: High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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This demonstration of average density uses understandable units of total mass and volume of the Earth. The required supplies are a can of beer or soda and a 1-pound bag of pretzels. By imagining, for instance, 4.4 bags of pretzels fitting into a beer/soda can, students can better visualize the average density of the Earth. Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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This demonstration uses a gyroscope (a bicycle wheel works well), string, and a turntable (optional) to show how the equatorial bulge of Earth causes precession. By balancing the spinning bicycle wheel on one hand, and pulling a string attached to the top axle with the other, the axis of the wheel traces out a circle (precesses). The site also explains how the moment of inertia is related to torque ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
Pedagogical help
Misconceptions: Read (1)
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This is a demonstration of the Core Shadow Zone of the Earth. Using a clear or translucent half-sphere held in front of a light source, the refracting properties of the core and how it generates the shadow zone on the surface are illustrated. Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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This demonstration of the magnetic field lines of Earth uses a bar magnet, iron filings, and a compass. The site explains how to measure the magnetic field of the Earth by measuring the direction a compass points from various points on the surface. There is also an explanation of why the north magnetic pole on Earth is actually, by definition, the south pole of a magnet. Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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National Science Education Standards (NSES): Read
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The Curie temperature for iron is reached at about 20 km depth in the Earth, and the temperature is much higher at the outer boundary of the Earth's core so that the iron there is no longer ferromagnetic (the electron spins in the iron can no longer align). This demonstration will help students understand the magnetic field of the Earth, and can help explain the variation of the direction of the field ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geophysics
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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Results 71 - 80 of 636 <<  4 5 6 7 8 9 10 11 12  >>