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Fine-grained, extrusive rocks include all of the following EXCEPT ____. a. granite c. basalt b. scoria d. pumice
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Basalt, Slag, which is also a type of basalt and Pumice are extrusive rocks, whereas the Granite is a rock that was intrusive. Instrusive rocks, as the name suggests, are formed within the crust of the Earth, and tend to solidify slowly. This causes them to be coarse-grained. Extrusive rocks are formed outside of the crust of the Earth and tend to cool and solidify faster than intrusive rocks. Therefore, these rocks are smooth and of fine grain.