How could you distinguish (a) granite from gabbro; (b) basalt from limestone; (c) schist from diorite?

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How could you distinguish 

(a) granite from gabbro;

(b) basalt from limestone; 

(c) schist from diorite?

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Related Book For  answer-question

The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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