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Exam 1 Slides

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QuestionAnswer
What did Harry Hess find? Eqs and heat at the ridges: Earth is splitting apart, Seafloor spreads, Ocean floor is consumed at trenches
What is plate tectonics theory? Earth’s lithosphere is divided into plates that move relative to each other
How does a mineral break? Cleavage and fracture
What is cleavage? Mineral breaks along planes of weakness (cleavage planes); clean breaks
What is fracture? Irregular breakage pattern of mineral
What are mineral resources? Minerals extracted from the earth’s crust for use by people
What is economic material? Minerals with commercial value
What are native metals? Metals that consist of only metals
What are ores? Minerals from which metals can be extracted
What is smelting? Process by which metals are extracted from rock or minerals
What is a magma source? Rock that melts to produce a magma
What are intermediate rocks? Composition partway between felsic and mafic; Grey
What are porphyritic rocks? Starts out cooling slowly, then brought to surface and cools fast
What are flood basalts? Mafic lava floods 10s to 100s of kilometers across the landscape; Huge
What are vesicles? Holes; magma is gassy
What is the common texture of extrusive rocks? Fine
What is the common texture of intrusive rocks? Coarse
What is glassy when referring to extrusive rocks? no minerals present; cools with water; Obsidian
What is the composition of basaltic magma? Mafic
What is the composition of rhyolite magma? Felsic
Where is basaltic magma located? Divergent boundaries and oceanic hotspots
What does basaltic magma produce? Shield volcanoes
Where is rhyolite magma located? Hotspots (usually continental), subduction zones
What is the eruption style of shield volcanoes? Quiet (effusive)
What is the eruption style of cinder cone volcanoes? Explosive
What is the eruption style of stratovolcanoes? Very explosive (most murdery)
What is the viscosity of shield volcanoes? Low
What is the composition of cinder cone volcanoes? Mafic- Intermediate
Created by: user-1965680
 

 



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