Select the one substance that is not a rock.
Brass is made by humans. It is not a pure substance. Shale is a solid. It is not a pure substance. Granodiorite is not a pure substance. It is a solid.
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.
Brass is made by humans. But rocks are not made by living things.
So, brass is not a rock.
Granodiorite is a rock.
Shale is a rock.