Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Search
Follow The Annenberg Learner on LinkedIn Follow The Annenberg Learner on Facebook Follow Annenberg Learner on Twitter
MENU

Teachers' Lab
The goal of the Teachers' Lab is to provide teachers and educators with a deeper understanding of commonly taught math and science concepts. Many of the Labs are based upon professional development workshops broadcast on the Annenberg Channel.

Interactives
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.

 

© Annenberg Foundation 2014. All rights reserved. Legal Policy