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OpenStudy (anonymous):

Which of the following is an example of extrusive rock that has cooled too quickly for grains to form? a. Volcanic glass b. Basaltic rock c. Granitic rock d. All of the above @-BeYourself20-

OpenStudy (anonymous):

what do u think??

OpenStudy (anonymous):

a

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

Obsidian, which is volcanic glass,

OpenStudy (anonymous):

can yu answer my message @-BeYourself20-

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