GPHreviewsession - ReviewStudySession Weathering Chemical...

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Review Study Session Weathering Chemical – chemical alteration of minerals Physical - cracks Chemical Weathering This process occurs because minerals formed deep in the earth’s interior are not stable under surface conditions Mafic minerals weather fastest Water Oxidation o Weathered with acidic water forms iron and rust red color (Sedona) Silicates o Quartz: very stable, slow weathering, doesn’t weather much o Feldspar: weathers to clay minerals – hydrolysis o Mafic Minerals: decompose to oxides – oxidation Hydrolysis o Acidic water Acid Rain o Both natural and anthropogenic processes cause acidification of precipitation o Anthropogenic oxides of N are by-products (nitric acid) automobile emissions can create acid rain factories releasing sulfuric acid can cause acid rain Carbonates (limestones)
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o Easily soluble in water (with some acid present) Simply just dissolve… Spheroidal Weathering Something that starts off sharp and square and is weathered into something smooth and circular Karst Topography and Landscapes Karst o Areas of limestone that are dissolving (weathering) o Usually present with caves, caverns and sinkholes throughout (sinkholes can make whole lakes disappear underground, presenting very clear holes in the ground with large towers of rocks and minerals surrounding bodies of water)
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GPHreviewsession - ReviewStudySession Weathering Chemical...

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