This site, part of Exploring Earth Investigation by McDougal Littell and TERC, examines how igneous rocks form. The investigations "were designed to build students' knowledge of Earth Science concepts?and to raise s...
The article, by Dr. Anders Bodare, described the four types of waves, (P, S, R and L) and their particle movements are shown schematically. Bodare also gives information for P- and S-wave speeds for some rock material....
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