Thursday, November 24, 2011

Anyone know the answers to these geology questions?

1. While working in the field, you find a dike cutting across some sedimentary rocks. What grain size would you expect to find in this pluton?





glass


fine-grained


aa


coarse-grained


nonfoliated





2. Batholiths are known to form the cores of mountain ranges such as the Sierra Nevada. What is the implication of this observation?





Because the batholith is at the surface, it implies close proximity to a transform boundary.


Because batholiths form deep within Earth, the occurrence of one at the surface implies that it has since been uplifted and/or the rocks above have been removed.


Because the batholith is exposed at Earth鈥檚 surface, it implies an effusive or quiescent eruption.


Because the batholith is at the surface, it implies close proximity to a divergent zone.


Because the batholith is at the surface, it implies that the magma in it cooled quickly.|||I would say fine grained for the first one, but im not entirely sure if you mean the dike or the sedimentary rock. But Im going with the dike. One that it is in sedimentary rocks which have not been altered which means they must be somewhat close to the surface. So the dike would be close to the surface which means it would have cooled somewhat rapidly and begun to form small crystals so small grained.





the second one is the second one because inorder for something that formed deep within the earth to be at the surface some form of weathering and/or uplift must have occured.

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