Select the one substance that is not a rock.
Conglomerate is not made by living things. It is not a pure substance. A computer processor is made in a factory. It is a solid. Marble is not made by living things. It is not a pure substance.
Rocks are made of minerals. Here are some properties of rocks:
They are solid.
They are formed in nature.
They are not made by living things.
They are not pure substances.
Compare the properties of each substance to the properties of rocks. Select the substance whose properties do not match those of rocks.
A computer processor is made in a factory. But all rocks are formed in nature.
So, a computer processor is not a rock.
Marble is a rock.
Conglomerate is a rock.