Select the one substance that is not a rock.
A marble is made by humans. It is a solid. Dolerite is a solid. It is not made by living things. Marble is not made by living things. It is formed in nature.
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 marble is made by humans. But rocks are not made by living things.
So, a marble is not a rock.
Marble is a rock.
Dolerite is a rock.