Look ahead to the full-page photos at the beginnings of Chapters 5 and 6. Which features of these rock outcrops are similar? Which features are different?
If you were to take samples from these two outcrops and examine them closely, what would you look for to determine that one rock is sedimentary, whereas the other is metamorphic?
What will be an ideal response?
Both photos have rocks that look "layered." The layers in the Chapter 5 opener look very uniform, that is the layers all appear to have similar thicknesses. The layers in the Chapter 6 opener have layers of various thicknesses and irregularities within the layers (rippling effect or lenses). I would look at the texture and composition of my samples to determine rock type. The sedimentary rock might consist of individual grains or a fine-grained texture if the material precipitated from water. The metamorphic rock would have an interlocking texture of grains (recrystallization), minerals that form under metamorphic conditions, and crystals all aligned in one direction (foliation).
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A. minimum thermometer B. thermistor C. maximum thermometer D. thermograph
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What will be the ideal response?