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Travel
west on 15th Avenue passing Hayward Field and the Student Recreation
Center, both on your left. Notice the hexagonal
basalt columns that create the waterfall. These large columns
are pieces of basalt. The hexagon shape is the natural symmetrical
effect that can take place in the formation of basalt during the
cooling process. This particular basalt is characterized by columnar
jointing which produces six-sided prisms of basalt forming at
right angles to the flow. You can see more basalt columns, such
as these, on the west side of Skinner Butte. Do you remember what
type of rock forges by the cooling and solidification of molten
rock?*
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