While hiking with two of your classmates, you observe an outcrop of sandstone rich in quartz and feldspar. Friend A says that the sand grains in the rock were eroded from a nearby basaltic volcano
Friend B says that the sandstone was derived from a more distant granite outcrop. Which one of your friends is right and why?
What will be an ideal response?
Friend B is right. Granite is rich in quartz and feldspars. The basalt volcano produces basalt, with no quartz.
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