rock layers canyon |
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| navigate by keyword : activity alps andes californias canyon carves cayon cleft cliff cliffs cooling deep drop erosive escarpments examples flats formed geologic gorge gorges hill himalayas igneous lava magma magmatic metamorphic mountain mountains mountaintype narrow nevada one opening peaks provo ranges rift river rock rocky salt scales sediment sedimentary sierra slot smooth solidification splits springs stream sulfur three time utah valley walls weathering yosemite |
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| To look at rock layers, geologists use a diagram called a stratigraphic column. It shows the rock layers with the oldest on the bottom, and the youngest on the top. That means that the bottom layer was formed first, and every subsequent layer was formed later, with the youngest rocks on the top. |
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