4 - GEOL 0820 Ramsey Natural Disasters Spring, 2011 LECTURE...

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GEOL 0820 Ramsey Natural Disasters Spring, 2011 Date: 18 January 2011 I. Rock Types why do we care about this for Natural Disasters? o certain minerals, rock compositions/textures can tell a geologist a lot about the hazardous condition: ± explosive potential of previous volcanic eruptions ± the potential of rocks/soil to absorb water in a flood ± the composition of rocks and their orientation as potential landslide locations so what is a rock? o rock: a naturally occurring solid made of one or more minerals or other solid substances ± is coal a rock?? _________________ o examples: sandstone made of only quartz mineral grains is a rock, a limestone made up of only fossils is also a rock ± informal exercise: what rock types do you see when entering the Cathedral?? _______________, _______________ Igneous Rocks o form when molten (melted) rock cools and solidifies either under or on the Earth's surface ± solidifies slowly: large mineral crystals form ± solidifies quickly: glass forms
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4 - GEOL 0820 Ramsey Natural Disasters Spring, 2011 LECTURE...

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