GEOL 1601 : 1601 Spring 2017 Mid Term Exam Key
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As a result of the process of (1) _________ that occurs at this ridge, the youngest oceanic crust in the north atlantic must be located (2) Short questions: 6 pts each (18 pts: describe at least two ways how you could tell the difference between calcite and quartz. Quartz: vitreous-waxy to dull luster, no cleavage, hardness 7, sio2. Calcite: vitreous luster, perfect cleavage in 3 directions, hardness 3, caco3: define phaneritic and aphanitic. What do these terms tell us about the cooling history of igneous rocks (i. e. , rates of cooling) Phaneritic: coarse grained, 1-10 mm, slow cooling: how is a sedimentary rock formed? (hint: list 5 sedimentary processes) Bonus (15 pts): name the earth"s spheres are shown in the above figure (10 pts): geosphere, hydrosphere, biosphere, atmosphere, the process shows how different rocks can evolve from a single body of magma as it cools down is.
