Collisional mountains - Geosc 10 Tuesday, March 30th, 1999...

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Geosc 10 Tuesday, March 30th, 1999 Announcements: Lecture notes: Example questions on the exam: Describe where the Badlands fall on the rock cycle. answer : sedimentation Give an example of mechanical weathering in a glacial environment answer : mechanical weathering due to water melting and flowing I. Themes for Exam II A. Collisional mountains --normal outcome of subduction; when continents passively move along with the ocean crust (ex. Australia, Japan) B. Metamorphism --growth of new minerals; change in minerals of any rock; bonds breaking and forming due to thermal reactions; diffusion of chemical species that form new minerals C. Weathering 1. Mechanical weathering (physical weathering) a. Physical break-up of rock; needs water because it's the only compound that has a change in volume when it freezes and therefore it forces and splits apart rocks in low temperatures b. Crack expansion caused by plants and roots; roots split the rock apart 2. Chemical weathering --the making of new minerals by any chemical process a. Hydrolysis --chemical breaking apart of rock by water; gradual replacement of unstable materials by stable ones b. Acid-enhanced --a little faster today than in earlier years; any
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This note was uploaded on 02/21/2008 for the course GEOSC 10 taught by Professor Furman during the Spring '99 term at Pennsylvania State University, University Park.

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Collisional mountains - Geosc 10 Tuesday, March 30th, 1999...

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