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IRIS: Layers of the Earth
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Educational Use
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Earth's interior is broadly grouped into three main layers on the basis of chemical composition: crust, mantle, and core. An egg analogy is used to show relative thicknesses, and a Big Hunk analogy illustrates how a material of a single composition can be either brittle or ductile depending on temperature. [6:20]

Subject:
Science
Material Type:
Audio/Video
Provider:
Incorporated Research Institutions for Seismology (IRIS)
Date Added:
12/01/2023
IRIS: Layers of the Earth - What Is the Moho?
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Educational Use
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This animation discusses the history of the discovery of the Mohorovicic Discontinuity, as well as the logic behind it. Spoiler Alert: It is about Snell's Law. [9:22]

Subject:
Science
Material Type:
Audio/Video
Provider:
Incorporated Research Institutions for Seismology (IRIS)
Date Added:
12/01/2023
IRIS: Plate Boundaries: Three Types Differentiated
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Educational Use
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Learn to define a tectonic or lithospheric plate; differentiate between continental and oceanic plates; differentiate between the 3 types of plate boundaries; and learn about the generalized seismicity associated with boundaries. [6:58]

Subject:
Mathematics
Science
Material Type:
Audio/Video
Provider:
Incorporated Research Institutions for Seismology (IRIS)
Date Added:
12/01/2023
IRIS: Plate Tectonic Theory: A Brief History
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Educational Use
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This animation gives an overview of the most-recognized proponents (and opponents) of Plate Tectonics Theory up into the 1960's, with the discoveries that helped form the theories. [5:56]

Subject:
Social Studies
Material Type:
Audio/Video
Provider:
Incorporated Research Institutions for Seismology (IRIS)
Date Added:
12/01/2023
IRIS: Seismic Wave Behavior: A Single Boundary Refracts & Reflects
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Educational Use
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This introduction to seismic wave behavior describes Snell's Law and how it applies to layers in the earth. It addresses reflected, refracted, critically refracted, and head waves. Seismic waves travel at different speeds through different materials. In this 2-layer model two wave fronts leave an impact at the same time but the lower layer is faster. [2:18]

Subject:
Science
Material Type:
Audio/Video
Provider:
Incorporated Research Institutions for Seismology (IRIS)
Date Added:
12/01/2023