Answer:
Substance
<u>Review</u>:
⇒ One of a class of substances that cannot be separated into simpler substances by chemical means.
<u>Compound</u>:
⇒ A pure substance composed of two or more elements who composition is constant.
Answer:
d
Explanation:
look at it it's all over the place
The older the Earth's crust, the denser it is.
I just looked it up, it's carbon!
