Select the one substance that is not a rock.
Soapstone is a solid. It is not made by living things. Paper is made in a factory. It is a solid. Chert is a solid. 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.
Paper is made in a factory. But all rocks are formed in nature.
So, paper is not a rock.
Chert is a rock.
Soapstone is a rock.