Select the one substance that is not a rock.
A: A computer processor is made by humans. It is not a pure substance.
B: Slate is not a pure substance. It is a solid.
C: Calcarenite is not a pure substance. It is formed in nature.
Compare the properties of each substance to the properties of rocks. Select the substance whose properties do not match those of rocks.
Calcarenite is a rock.
Slate is a rock.
A computer processor is made by humans. But rocks are not made by living things.
So, a computer processor is not a rock.