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Plumb-Line Task
Water-Level Task

This is a glass container. It has some water in it.
Now the container has been tilted. Draw a line to show how the water would look.
Now the van is parked on a hill. Draw a line to show how the rope and weight would look.
Van on level
Van on hill
This is a van. Inside is a weight hanging from a rope.
after Vasta et al. (1996)
Measuring Strike and Dip
McGeary and Plummer (1998)