A student takes granite, a sample of igneous rock, and masses it. She records the initial mass. She then places the rock into a rock tumbler, which mechanically tumbles the rock on a continuous cycle. After two weeks, the student removes the rock from the tumbler
and takes its final mass. She makes observations that the rock seems smoother and has lost 8% of its mass over time.
Select the independent variable in this experiment and the step of the rock cycle the student is most likely modeling.
es )
A)
B)
The independent variable is the type of the rock and the student is
modeling melting.
The independent variable is the final mass of the rock and the student is
modeling crystallization.
The independent variable is the presence of the rock tumbler and the
student is modeling weathering.
The independent variable is the speed of the rock tumbler and the student
is modeling sedimentation.
D) The independent variable is the speed of the rock tumbler and the student is modeling sedimentation.