Lecture 12 Notes

Lecture 12 Notes - At the Bonneville Salt Flats, like other...

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At the Bonneville Salt Flats, like other salt flats around the world, water containing dissolved ions enters the area and escapes only by evaporation. When the water evaporates, it leaves behind the dissolved ions which precipitate into chemical sediments. In this particular area, many of the dissolved ions are Na + , K + , and Cl - , which precipitate as salt. This is an ideal place for racing because it is very flat and salt has a very low friction which causes less drag on tires.
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Important notes about quizzes On the electronic sheets, you must write AND bubble in your correct posting ID to get credit. When filling in your posting ID, you fill your numbers in FROM THE LEFT. No hyphens or spaces. Some people have the same ID number on their ID card twice- in that case, your Posting ID does NOT follow the formula. Ex: If your two numbers are 1000876543 and 1000876543, your posting ID will NOT be 6543-543! If you still don’t know your posting ID, you can find it at the following site: 1) Log in to MyASU 2) Go to the MyProfile tab 3) Scroll down to >IDs 4) Click the link to display your ID information 5) Find your Posting ID
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Factors that influence how easily a rock weathers 1.The type of minerals in the rock 2. Physical structure of the rock 3.Climate: Rainfall and Temperature 4.The presence or absence of Soil Review
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Don’t worry about knowing all of these. The ones to know are on the next slide. These will stay around for a while These weather very easily 1. The type of minerals in the rock Some minerals weather much faster than others. Review
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Quartz Clay Hematite Feldspar Olivine Calcite Halite Slow rate of weathering Fast rate of weathering Very Resistant (stays around for a long time) Sort of Resistant (stays around for a little while) Not resistant at all (quickly degrades into something else) These are the ones to know Also know this - For silicate minerals: Mafic minerals weather faster than felsic minerals! Review
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Amphibole Weathers rather easily Resistant – stays around for a long time
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Quartz sand Erosion Most sand on the beach is made of quartz that was once in granites in the mountains. The mountains weathered away into sediments that were transported down a river. Quartz is the most resistant mineral, so oftentimes, it is the only mineral left by the time the sediments reach the beach.
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2. Physical structure of the rock Massive – not as easily weathered Bedded – more easily weathered Rocks that have weak layers or joints are more easily weathered than rocks that are massive (meaning there are no weak layers or joints).
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3. Climate: Rainfall and Temperature Weathering reactions are faster with higher temperatures and plenty of water. Hot, humid areas (tropical) – very fast weathering Hot, arid areas (desert) – low weathering Cold, arid areas (arctic) – very low weathering
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Soil promotes weathering because a) it retains water (remember, water promotes weathering) b) has organisms, creating an acidic environment Rocks weather much faster if they are covered by soil
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This note was uploaded on 03/03/2010 for the course GEOLOGY glg 321 taught by Professor Na during the Spring '10 term at ASU.

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Lecture 12 Notes - At the Bonneville Salt Flats, like other...

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