A Scientist Identifies a Rock Sample as Andesite

question 4

Multiple Choice

A scientist identifies a rock sample as andesite. Why did he do so?

• A) He observed that the rock has a lot of silica, making it mafic.
• B) He observed that the rock has a lot of silica, making it ultra-mafic.
• C) He observed that the rock has a decent amount of silica, making it intermediate.
• D) He observed that the sample has little silica, making it felsic.

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