Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

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Learner Express
Learner Express is a gallery of short video modules distilled from over 350 hours in the Annenberg Learner Collection. The science topics are useful in a STEM-based curriculum, while the math topics align with the Common Core Standards. You can quickly locate 1-5 minute videos to enhance classroom or professional learning. Indexed, annotated, and linked to related resources, Learner Express embodies the best of just-in-time learning.

Volcanoes: Can we predict volcanic eruptions? Melting Rocks
Melting Rocks: Try your hand at melting rocks. Before talking about predicting eruptions, we need to look at why they occur.

How do volcanoes form?

Deep inside Earth, between the molten iron core and the thin crust at the surface, there is the mantle, a large layer of rock that is largely solid, but flows like plastic. When, for various reasons, rock from the mantle melts, it sometimes moves to the Earth?s surface through weak spots in the crust, releasing heat, gasses, and rock--a volcanic eruption. But why does this solid rock melt and come to the surface?

From Magma to Lava
Extremely high temperature and pressure can cause the lower mantle to melt and become liquid rock, or magma. When a body of magma rises through the denser rock layers toward Earth's surface, some of it remains liquid. Magma that has reached the surface is called lava.

Lava Types
Magma comes in different "flavors," or compositions. Each of these will produce a different lava, from fluid, fast-moving basalt to slower, more viscous andesite. Because rocks are made up of collections of minerals that melt at different temperatures, the makeup of the rock being melted affects the magma that results.

Viscosity video clip (Quicktime, 39 seconds, 4,316K)
Take a look at two lava types: pahoehoe and slow, viscous aa.

[Read More About MELTING ROCKS]

IntroductionMelting RocksDynamic EarthJudging HazardsForecastingCoping with RiskRelated Resources

"Volcanoes" is inspired by programs from Earth Revealed.


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